Beckwith, Burnham Putnam, author
Columbia University Press, 1955
Buku Teks
Habib, M.A.R., author
Blackwell, 2008
Buku Teks
Carl I. Fertman, Diane D. Allensworth
Jossey-Bass , 2017
Buku Teks
Cherry, Edith
John Wiley & Sons, 1999
Buku Teks
McDonald, Lee Cameron, author
Harcourt, Brace & World, 1968
Buku Teks