Velasquez, Manuel G., author

Pearson, 2014

 Buku Teks

Rosile, Grace Ann, author

Emerald, 2016

 eBooks

Desjardins, Joseph, author

McGraw-Hill, 2014

 Buku Teks

Pearson Education , 2005 2005

 Multimedia

Ghillyer, Andrew W., author

McGGraw-Hill Higher education, 2008

 Buku Teks