APA

Perroy L., . (1922). The ascent of Calvery. New York: Kenedy.

Chicago

Perroy Louis, . 1922. The ascent of Calvery. New York: Kenedy.

Harvard

Perroy L., . (1922). The ascent of Calvery. New York: Kenedy.

MLA

Perroy Louis, . The ascent of Calvery. New York: Kenedy. 1922.