Either Rana Mitter's Forgotten Ally: China's World War II, 1937-1945 or Hans van de Ven's China at War: Triumph and Tragedy in the Emergence of the New China 1937-1952 would suffice - both are on the AH booklist here and here.

If I had to pick one, Mitter has a more approachable narrative. His selected bibliography at the end is also useful if you want to do some further reading into certain aspects of the war.

On Tuchman's Stilwell and the American Experience in China," it should be noted that the book is somewhat controversial because of the person Stilwell was. Stilwell and Chiang hated each other and it led to a lot of biased information coming from Stilwell about the Chinese military and operations especially in the Burma theater (Stilwell referring to Chiang as "Peanut" in his diary for example), whereas British commanders in the field, FM William Slim or Admiral Mountbatten, are much less critical of the Chinese. In fact Stilwell was pretty much critical of everyone in the theater if he didn't get his way, that was just his attitude. So two good counter-reads covering the Stilwell stuff in Burma and southern China are Jay Taylor's The Generalissimo, a decent biography about Chiang Kai-shek himself published in 2009, with the entire second section covering all fronts of the war, but with a lot of emphasis on the Stilwell-Chiang dilemma, and Claire Chennault's memoir, Way of a Fighter. Chennaults work is a primary source and therefore not academic in nature, and if you're not familiar with Chennault he was an American pilot who commanded the semi-infamous "Flying Tigers" unit of American planes sent to China to help fight Japan. He was also a high ranking officer in the know about American and Chinese logistics, fought from Chongqing to Burma, and was a close friend of Chiang, so his memoir has value.

On to some good intro sources on the war in general:

James Hsiung and Steven Levine (editor), China's Bitter Victory: War with Japan, 1937-1945, I liked this book, and since someone already mentioned Mitter's Forgotten Ally, it was one I could think up.

Edward Dreyer, China at War, 1901-1945, is a good textbook for both the war itself, and some background information as to why China's military was just so inefficient when Japan began making war against China. This book is a little outdated though.

Ive never read, but the book The Battle for China: Essays on the Military History of the Sino-Japanese War 1937-1945 has good reviews, and the authors are well known historians.

I'm also going to link this but you don't have to care for it; I really enjoy diplomatic correspondence and it puts a lot into perspective from foreigners. You can visit https://history.state.gov/historicaldocuments/frus1937v03/comp1 for free and access all the diplomatic papers that the US Office of the Historian has compiled on the subject of war between China and Japan from American diplomatic eyes!

Peattie, Drea & Van De Ven's book "The Battle For China: Essays on the Military History Sino-Japanese War of 1937-1945" is pretty good. The timeline chapter "Overview of Major Military Campaigns" is a good survey.

I like the above book because it came out of a conference of international scholars and is a pretty good mix of Japanese, Taiwan (aka nationalist) and People's Republic of China sources and scholars.

To be honest though, I don't think there is a Great introductory work in English yet from Kuomintang and PRC sources. The above book isn't super approachable, and other works tend to focus on the political side of the war rather than the military history.