edited by David W. Reed
Buri International, 1993
Buku Teks
Aurum Press, 1984
Buku Teks
Ramon Magsaysay
Ramon Magsaysay Center, 1985
Buku Referensi
Europa Publications Limited
Europa Publications Limited, 1979
Buku Referensi
Carmelo & Bauermann, 1980
Buku Teks