Tiffin, Joseph, author
Prentice-Hall, 1958
Buku Teks
edited by P.J.D. Drenth ... [and others]
Wiley, 1984
Buku Teks
Siegel, Laurence, author
Richard D. Irwin, 1968
Buku Teks
Moore, Herbert, author
McGraw-Hill, 1942
Buku Teks
This, Leslie E.
Addison-Wesley Pub. Co. , 1974
Buku Teks