Παραπομπή APA

Barnes, C. W. (1934). Earth, time and life. John Wiley and sons.

Παραπομπή Chicago Style

Barnes, Charles W. Earth, Time and Life. New York: John Wiley and sons, 1934.

Παραπομπή MLA

Barnes, Charles W. Earth, Time and Life. John Wiley and sons, 1934.