Manila: National Library of Philippine, 1978 - 1984
Buku Referensi
Perpustakaan Nasional Republik Indonesia, {s.a}
Majalah, Jurnal, Buletin
Anttila, Raimo
Amsterdam John Benjamins 1977
Buku Teks
The National Library of The Philippines, 1992
Buku Referensi
The National Library of The Philippines
The National Library of The Philippines, 1989
Buku Referensi