edited by E.C. Cuff; G.C.F. Payne
George Allen and Unwin, 1984
Buku Teks SO
Sherman, Howard J.
Harper & Row, 1979
Buku Teks
Ross, H. Laurence (Hugh Laurence)
McGraw-Hill, 1973
Buku Teks
Sherman, Howard J.
Harper and Row, 1989
Buku Teks
edited by Howard Newby
John Wiley & Sons, 1978
Buku Teks