APA

Whitney Fredrick L,, . (1942). Elements of research. New York: Prentice Hall Inc.

Chicago

Whitney Fredrick L,, . 1942. Elements of research. New York: Prentice Hall Inc.

Harvard

Whitney Fredrick L,, . (1942). Elements of research. New York: Prentice Hall Inc.

MLA

Whitney Fredrick L,, . Elements of research. New York: Prentice Hall Inc. 1942.