APA

Duncan R. O., Watson H. B., . (1960). Introduction to physical education. New York: Ronald Press Co.

Chicago

Duncan Raymond Oscar, Watson Helen Belle, . 1960. Introduction to physical education. New York: Ronald Press Co.

Harvard

Duncan R. O., Watson H. B., . (1960). Introduction to physical education. New York: Ronald Press Co.

MLA

Duncan Raymond Oscar, Watson Helen Belle, . Introduction to physical education. New York: Ronald Press Co. 1960.