Morehead, Joe, author
Libraries Unlimited, 1978
Buku Teks
Nichols, Jeannette P., author
D. Appleton-Century, 1943
Buku Teks
McGovern, Edmond, author
Globefield Press, 1982
Buku Teks
Holloway, William Vernon, author
McGraw-Hill , 1951
Buku Teks
Maxwell, James A., author
Harvard University Press, 1946
Buku Teks