edited by Donald R. Gallo
Boynton/Cook, 1992
Buku Teks
International Biographical centre, 1986
Buku Referensi
editorial director, Ernest Ka
International Biographical Centre, 1986.
Buku Referensi
Hensderson, Gloria Mason, author
Pearson , 2006
Buku Teks
Hensderson, Gloria Mason
Longman , 2003
Buku Teks