APA

Howe H. F., Westley L. C., . (19901988). Ecological relationships of plants and animals. New York: Oxford University Press.

Chicago

Howe Henry F, Westley Lynn C, . 19901988. Ecological relationships of plants and animals. New York: Oxford University Press.

Harvard

Howe H. F., Westley L. C., . (19901988). Ecological relationships of plants and animals. New York: Oxford University Press.

MLA

Howe Henry F, Westley Lynn C, . Ecological relationships of plants and animals. New York: Oxford University Press. 19901988.