Faiz, Omar
Wiley Blackwell, 2011
Buku Teks
Martini, Frederic H.
Pearson Education, 2006
Buku Teks
Gray, Henry, 1825-1861
Lea & Febiger, 1985
Buku Teks
edited by Katie Scott and Deborah Cherry
Blackwell Publishing, 2005
Buku Teks
Riley, Noel, editor
Free Press, 2003
Buku Referensi