David, Joel, author
Anvil Pub, 1990
Buku Teks
The National Library of The Philippines
The National Library of The Philippines, 1989
Buku Referensi
The National Library of The Philippines, 1992
Buku Referensi
Campos, Patrick F, author
The University of the philippines Pres, 2016
Buku Teks
Manila: National Library of Philippine, 1978 - 1984
Buku Referensi