Yoder, Dale, author
Prentice-Hall, 1984
Buku Teks
edited by John W. Jones, Brian D. Steffy, Douglas W. Bray
Lexington Books, 1991
Buku Referensi
Yoder, Dale, author
McGraw-Hill, 1958
Buku Teks
Haire, Mason, author
McGraw-Hill, 1964
Buku Teks
Haire, Mason, author
McGraw-Hill, 1956
Buku Teks