APA

Emerton J. H., . (1961). The common spiders of the United States. New York: Dover Publications.

Chicago

Emerton J H, . 1961. The common spiders of the United States. New York: Dover Publications.

Harvard

Emerton J. H., . (1961). The common spiders of the United States. New York: Dover Publications.

MLA

Emerton J H, . The common spiders of the United States. New York: Dover Publications. 1961.