Gaya APA

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

Gaya MLA

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