Cita APA (7a ed.)

HOWELL F CLERK. (1980). EARLY MAN (2ND.). TIME LIFE BOOKS.

Cita Chicago Style (17a ed.)

HOWELL F CLERK. EARLY MAN. 2ND. HONGKONG: TIME LIFE BOOKS, 1980.

Cita MLA (9a ed.)

HOWELL F CLERK. EARLY MAN. 2ND. TIME LIFE BOOKS, 1980.