Gaya APA

Flint, R, F., Swanson, C, P. (1973). The Earth and its History . New York: New York: W.W. Norton & Company; 1973.

Gaya MLA

Flint, Richard, Foster., Swanson, Carl, P.. "The Earth and its History". New York: New York: W.W. Norton & Company; 1973, 1973. Text.