Like Kerbal Space Program? Then check out this book: Apollo. Or if you're more interested in the science behind spaceflight, you might like this: Fundamentals of Astrodynamics

KSP Parts

Title Package Author Cost Mass Crash Tolerance Drag Max Temp
C7A-EFS-1 External Fuel System C7 Aerospace Pack - Experimental Version 3 HarvesteR - Texture Mod by C7 250 0.1 12 0.0 3600