At the risk of sounding unhelpful, I would argue that the question already presupposes an ideology - the idea that there can be a value-neutral interpretation of history. Far better than trying to find an 'unbiased' source would be reading thorough, thought provoking and well-reasoned sources with different (and even conflicting) biases. I would include in this category:

• 'The Zionist Idea' by Arthur Herzberg
• 'One Palestine, Complete' by Tom Segev
• 'Israel: A Colonial-Settler State?' by Maxime Rodinson
• '1948: A History of the First Arab–Israeli War' by Benny Morris
• 'The Birth of the Palestinian Refugee Problem Revisited' by Benny Morris
• 'All That Remains' by Walid Khalidi
• 'My Promised Land' by Ari Shavit
• '1967: Israel, the War, and the Year That Transformed the Middle East' by Tom Segev
• 'The Iron Cage' by Rashid Khalidi
• 'I Saw Ramallah' by Mourid Barghouti
• 'Armed Struggle and the Search for a State' by Yezid Sayigh
• 'Enemies and Neighbours' by Ian Black

-The last book is closest to what you want, but you will have a far richer understanding of the conflict if you read the other ones.