Making Human GeographyKevin R. Cox
When to Use What Research DesignW. Paul Vogt, Dianne C. Gardner, and Lynne M. Haeffele
Elementary Statistics for Geographers: Third EditionJames E. Burt, Gerald M. Barber, and David L. Rigby
Missing Data: A Gentle IntroductionPatrick E. McKnight, Katherine M. McKnight, Souraya Sidani, and Aurelio José Figueredo