Shier, David, author
McGraw-Hill, 2004
Buku Teks
Patton, Kevin T.
Elsevier, 2010
Buku Referensi
Shier, David, author
McGraw-HIll. , 2001
Buku Teks
Silverthorn, Dee Unglaub, author
Pearson, 2019
Buku Teks
Luciano, Dorothy S., author
McGraw-Hill , 1978
Buku Teks