William N. McFarland ...[et al.]
Macmillan, 1979
Buku Teks SO
Pough, F. Harvey
Prentice-Hall, 1999
Buku Teks SO
Orr, Robert T.
Saunders, 1976
Buku Teks SO
editors, Norman K. Wessells, Elizabeth M. Center
William Kaufmann, 1973
Buku Teks SO
Young, J.Z.
Clarendon, 1962
Buku Teks SO