Gaya APA

Blij, H, J, D., Birdsall, S, S. (1971). Geography Region & Concepts 2e . Canada: John Wiley & Sons, Inc..

Gaya MLA

Blij, Harm, J., De., Birdsall, Stephen, S.. "Geography Region & Concepts 2e". Canada: John Wiley & Sons, Inc., 1971. Text.