Burby, Raymond J.
Westview Press, 191
Buku Teks
Abbott, Patrick L., author
McGraw-HIll, 2003
Buku Teks
Abbott, Patrick L., author
McGraw-Hill, 2009
Buku Teks
Penna, Anthony N, author
Blackwell, 2013
Buku Teks
Abbott, Patrick L., author
McGraw-Hill , 2004
Buku Teks