Gaya APA

Klimm, L, E. et al (1956). Introductory Economic Geography (Ed. 3). America: Harcourt, Brace & World, Inc.

Gaya MLA

Klimm, Lester, E.. et al. "Introductory Economic Geography". Ed. 3 America: Harcourt, Brace & World, Inc, 1956. Text.