How do you tell if a D&D book is 3.0 or 3.5?

I’m new to d20. I recently acquired a bunch of D&D books and I’m sure they are all either 3.0 or 3.5, but it doesn’t say in the book which version it is. How can I tell which version the book is?

For instance, I have “Complete Warrior – A Player’s Guide to Combat for All Classes”. It’s hard back, published in ’03. Is it 3.0 or 3.5?

Another example, I have “Sword and Fist – A Guidebook to Fighters and Monks”. Perfect Bound, published in ’01. Is it 3.0 or 3.5?