Amadi-Enchendu, Joe E., editor
Springer- Verlag, 2012
eBooks
McMillan, Claude, author
R.D. Irwin, 1973
Buku Teks
McMillan, Claude, author
Ta Tung Book , 1971
Buku Teks
edited by Alexis Papathanassis, Michael H. Bretner, Cornelia Schoen and Nadine Guhr
Gabler Verlag, 2012
eBooks
Uhl, Kenneth P., author
John Wiley & Sons, 1969
Buku Teks