APA

Britton N. L., Brown A., . (1970). An illustrated flora of the Northern United Stated and Canada. New York: Dover.

Chicago

Britton Nathaniel Lord, Brown Addison, . 1970. An illustrated flora of the Northern United Stated and Canada. New York: Dover.

Harvard

Britton N. L., Brown A., . (1970). An illustrated flora of the Northern United Stated and Canada. New York: Dover.

MLA

Britton Nathaniel Lord, Brown Addison, . An illustrated flora of the Northern United Stated and Canada. New York: Dover. 1970.