The picture book of perennials

MLA

Nehrling, Arno, Irene Nehrling, and Charlotte E Bowden. The Picture Book of Perennials. New York: Hearthside Press, 1964.

APA

Nehrling, A., Nehrling, I., & Bowden, C. E. (1964). The picture book of perennials. New York: Hearthside Press.

Chicago

Nehrling, Arno, Irene Nehrling, and Charlotte E Bowden. The Picture Book of Perennials. New York: Hearthside Press, 1964.