Kuriloff, Arthur H., author
McGraw-Hill, 1966
Buku Teks
Krueger, Myron W., author
Addison-Wesley, 1983
Buku Teks
Stewart, Rosemary, author
Pan Books, 1967
Buku Teks
Dooley, Thomas A.
Farrar, Straus and Company, 1958
Buku Teks
Gray, Edmund R., author
Macmillan, 1990
Buku Teks