Gaya APA

Strahler, A, N., Strahler, A, H. (1983). Instructor's manual for modern physical geography (2nd Ed). United States of America: .

Gaya MLA

Strahler, Arthur, N.., Strahler, Alan, H.. "Instructor's manual for modern physical geography". 2nd Ed United States of America: , 1983. Text.