APA

Gilbreth F. B., Carey E. M. G., . (2002). Cheaper by the dozen. New York: Perennial Classics.

Chicago

Gilbreth Frank B, Carey Ernestine Moller Gilbreth, . 2002. Cheaper by the dozen. New York: Perennial Classics.

Harvard

Gilbreth F. B., Carey E. M. G., . (2002). Cheaper by the dozen. New York: Perennial Classics.

MLA

Gilbreth Frank B, Carey Ernestine Moller Gilbreth, . Cheaper by the dozen. New York: Perennial Classics. 2002.