APA (7th ed.) Citation

Harlow, W. M. (1946). Fruit key to northeastern trees. [publisher not identified].

Chicago Style (17th ed.) Citation

Harlow, William Morehouse. Fruit Key to Northeastern Trees. [Syracuse, N.Y.]: [publisher not identified], 1946.

MLA (9th ed.) Citation

Harlow, William Morehouse. Fruit Key to Northeastern Trees. [publisher not identified], 1946.