Gaya APA

Exercises in physical geograhy. (1999). New York: McGraw-Hill.

Gaya Chicago

Exercises in physical geograhy. 3rd. New York: McGraw-Hill, 1999. Buku.

Gaya MLA

Exercises in physical geograhy. 3rd. New York: McGraw-Hill, 1999. Buku.

Gaya Turabian

Exercises in physical geograhy. New York: McGraw-Hill, 1999. Buku.