Johnson, James T., author
South-Western Publishing, 1965
Buku Teks
edited by James L. Gibson
Tex Business Publications , 1982
Buku Teks
Westing, John Howard, author
Prentice-Hall, 1957
Buku Teks
Lee, Alfred McCluny
Barnes ,
Buku Teks
Haber, Audrey, author
Addison-Wesley , 1970
Buku Teks