APA

Fergusson E., . (1937). Guatemala. New York: Knopf.

Chicago

Fergusson Erna, . 1937. Guatemala. New York: Knopf.

Harvard

Fergusson E., . (1937). Guatemala. New York: Knopf.

MLA

Fergusson Erna, . Guatemala. New York: Knopf. 1937.