APA

Hausman L. A., . (1948). Field guide for birds, wild flowers and nature study. New York: Grosset & Dunlap.

Chicago

Hausman Leon Augustus, . 1948. Field guide for birds, wild flowers and nature study. New York: Grosset & Dunlap.

Harvard

Hausman L. A., . (1948). Field guide for birds, wild flowers and nature study. New York: Grosset & Dunlap.

MLA

Hausman Leon Augustus, . Field guide for birds, wild flowers and nature study. New York: Grosset & Dunlap. 1948.