APA (7th ed.) Citation

Keil, H. L. (1977). Blight of pears, apples, and quinces (Rev. Feb. 1972, slightly rev. Apr. 1977.). Dept. of Agriculture, Agricultural Research Service.

Chicago Style (17th ed.) Citation

Keil, Harry L. Blight of Pears, Apples, and Quinces. Rev. Feb. 1972, slightly rev. Apr. 1977. Washington: Dept. of Agriculture, Agricultural Research Service, 1977.

MLA (9th ed.) Citation

Keil, Harry L. Blight of Pears, Apples, and Quinces. Rev. Feb. 1972, slightly rev. Apr. 1977. Dept. of Agriculture, Agricultural Research Service, 1977.