White, Robert M.
Academic Press, 1979
Buku Teks
edited by David W. Ewing
Harper & Brothers, 1958
Buku Teks
Ayres, Robert U.
McGraw-Hill, 1969
Buku Teks
Armstrong, J. Scott
John Wiley & Sons, 1985
Buku Teks
Ministry of Education and National Commission for Unesco, 1962
Buku Teks