APA

Worster D., . (1992). Under western skies. New York: Oxford University Press.

Chicago

Worster Donald, . 1992. Under western skies. New York: Oxford University Press.

Harvard

Worster D., . (1992). Under western skies. New York: Oxford University Press.

MLA

Worster Donald, . Under western skies. New York: Oxford University Press. 1992.