APA

Knudsen J. W., . (1966). Biological techniques; collecting, preserving, and illustrating plants and animals. New York: Harper & Row.

Chicago

Knudsen Jens W, . 1966. Biological techniques; collecting, preserving, and illustrating plants and animals. New York: Harper & Row.

Harvard

Knudsen J. W., . (1966). Biological techniques; collecting, preserving, and illustrating plants and animals. New York: Harper & Row.

MLA

Knudsen Jens W, . Biological techniques; collecting, preserving, and illustrating plants and animals. New York: Harper & Row. 1966.