Gasparic, Jiri
Ellis Horwood, 1978
Buku Referensi
editor, Joseph Sherma, Bernard Fried
Marcel Dekker, 2003
Buku Referensi
Touchstone, Joseph C.
John Wiley & Sons, 1983
Buku Teks
Svendsen, A. Baerheim
Elsevier , 1983
Buku Teks
edited by Joseph C. Touchstone
John Wiley & Sons, 1980
Buku Teks