APA

Johnson P. O., . (1949). Statistical methods in research. New York: Prentice-Hall.

Chicago

Johnson Palmer O, . 1949. Statistical methods in research. New York: Prentice-Hall.

Harvard

Johnson P. O., . (1949). Statistical methods in research. New York: Prentice-Hall.

MLA

Johnson Palmer O, . Statistical methods in research. New York: Prentice-Hall. 1949.