Osborn, Richard N., author
John Wiley & Sons, 1980
Buku Teks
Silverthorn, Dee Unglaub, author
Pearson, 2019
Buku Teks
Will, John W., author
Prentice-Hall, 2002
Buku Teks
Smith, C.S., author
Pitman, 1969
Buku Teks
Torgersen, Paul E., author
Prentice-Hall, 1972
Buku Teks