Muzos, Steven J.
Harper Collins College, 1992
Buku Teks
Branley, Franklyn M.
Ginn and Company, 1965
Buku Teks
Riedl, Rupert, author
John Wiley & Sons, 1978
Buku Teks
Stanley, Melissa, author
Addison-Wesley, 1984
Buku Teks
Simpson, George Gaylord, author
Harcourt Brace & World, 1964
Buku Teks