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Not too sure about interpretations of Manchukuo and how it changed over time. Have some primary and secondary sources from an essay I did a while back though:

Another Ambitious Plan to Colonize Manchuria. (1937). Far Eastern Survey, 6(1),

Ashizawa, Y. (1941). Statistical Investigations of the Physique of the Manchukuo Men. Jpn. J. Health Hum. Ecol, 9(1),

Blakeslee, G. and Rea, G. (1935). The Case for Manchukuo. The American Political Science Review, 29(6),

C., J. and Kinney, H. (1928). Modern Manchuria and the South Manchuria Railway Co. Pacific Affairs, 1(5),

C.P Wai- Nanking Intelligence and Publicity Department Ministry of Foreign Affairs (1933) How “Manchukuo” was created (Nanking)

China United Press, (1935) The Puppet State of “Manchukuo” (Shanghai)

Deshingkar, G. (1971). Bangladesh and Manchukuo: A wrong historical parallel. China Report, 7(6),

Duara, P. (2003). Sovereignty and authenticity. Lanham: Rowman & Littlefield Publishers.

Dubois, T. (2008). Rule of Law in a Brave New Empire: Legal Rhetoric and Practice in Manchukuo. Law and History Review, 26(02),

DuBois, T. (2010). Inauthentic Sovereignty: Law and Legal Institutions in Manchukuo. The Journal of Asian Studies, 69(03),

Duus, P., Myers, R., Peattie, M. and Zhou, W. (1996). The Japanese wartime empire, 1931-1945. Princeton, N.J.: Princeton University Press.

Earl of Lytton, (1932). The Problem of Manchuria. International Affairs (Royal Institute of International Affairs 1931-1939), 11(6), p.737.

Han, S. (2004). The Problem of Sovereignty: Manchukuo, 1932-1937. positions: east asia cultures critique, 12(2), pp.457-478.

Japanese Chamber of Commerce, (1933) Manchukuo: The Founding of the New State in Manchuria (New York)

Lin, M. (2011). Taiwan, Manchukuo, and the Sino-Japanese War. ASS, 7(6).

Manchukuo. (1932). The Round Table, 22(88),

Middlebush, F. (1934). International Affairs: The Effect of the Non-Recognition of Manchukuo. The American Political Science Review, 28(4), p.677.

Narangoa, L. (2001). Educating Mongols and Making ‘Citizens’ of Manchukuo. Inner Asia, 3(2),

OBLAS, P. (2004). Naturalist Law and Japan's Legitimization of Empire in Manchuria: Thomas Baty and Japan's Ministry of Foreign Affairs. Diplomacy & Statecraft, 15(1),

S., J. (1937). Another Ambitious Plan to Colonize Manchuria. Far Eastern Survey, 6(1),

Schumpeter, E. (2000). The industrialization of Japan and Manchukuo, 1930-1940. London: Routledge.

Smith, N. (2007). Resisting Manchukuo. Vancouver: UBC Press.

Timperley, H. (1934). Japan in Manchukuo. Foreign Affairs, 12(2),

Woodhead, H. (1932). A visit to Manchukuo. Shanghai, China: Mercury Press.