APA (7th ed.) Citation

SAGE Knowledge (Online service), Aitken, S. C., & Valentine, G. (2006). Approaches to human geography. SAGE.

Chicago Style (17th ed.) Citation

SAGE Knowledge (Online service), Stuart C. Aitken, and Gill Valentine. Approaches to Human Geography. London: SAGE, 2006.

MLA (9th ed.) Citation

SAGE Knowledge (Online service), et al. Approaches to Human Geography. SAGE, 2006.