Ross, H. Laurence (Hugh Laurence)
McGraw-Hill, 1973
Buku Teks
Cuff, E.C.
Routledge, 1995
Buku Teks
edited by E.C. Cuff; G.C.F. Payne
George Allen and Unwin, 1984
Buku Teks
Lauer, Robert H.
Allyn and Bacon, 1982
Buku Teks
Sherman, Howard J.
Harper & Row, 1979
Buku Teks