Glover, John Desmond, author
Richard D. Irwin, 1957
Buku Teks
Nankervis, Alan R., author
Thomas Nelson Australia, 1996
Buku Teks
Perry, John, author
McGraw-Hill, 1954
Buku Teks
edited by Max S. Wortman
Allyn and Bacon , 1970
Buku Teks
Dubin, Robert, author
Prentice-Hall, 1974
Buku Teks