Fraser, D.A.S., author
John Wiley & Sons, 1967
Buku Teks
Rickmers, Albert D., author
McGraw-Hill, 1967
Buku Teks
Leonard, J Martin, author
Teach Yourself Books, 1974
Buku Teks
Walpole, Ronald E., author
Macmillan, 1968
Buku Teks
Haber, Audrey, author
Addison-Wesley , 1971
Buku Teks