Fox, James R., author
Oceana Publication, 1992
Buku Referensi
Fox, James R., author
Oceana Publications, Inc, 1992
Buku Teks
Bledsoe, Robert L., author
ABC-Clio, 1987
Buku Referensi
edited by William E. Butler
Sijthoff & Noordhoff, 1980
Buku Teks
Vega, Connie de la, author
Edward Elgar, 2013
Buku Referensi