Goyal, Sandeep, author
CBS Publishers, 2015
Buku Teks
Counihan, Dan, author
2014
Buku Teks
Houston, W.J.B. (William John Ballantyne), author
Butterworth-Heinemann, 1992
Buku Teks
Proffit, William R, author
Mosby, 2000
Buku Referensi
Scuzzo, Giuseppe, author
Quintessenz Verlag, 2003
Buku Teks