Voich, Dan, author
Ronald Press, 1968
Buku Teks
Lundgren, Earl F., author
Confield, 1974
Buku Teks
Hicks, Herbert G., author
McGraw-Hill Kogakusha, 1974
Buku Teks
Mooney, James D., author
Harper & Row , 1974
Buku Teks
Thurston, Phillip H., author
Harvard University, 1959
Buku Teks