Kalagan alphabet book ill. by
Manila: Summer Inst. of Linguistics, 1955
 Buku Teks
Lammers, Joseph
Vollstandige rechtschreiblehre
Paderborn Ferdinand Schoning 1955
 Buku Teks
Buck, Carl Darling
A dictionary of selected synonyms in the principal Indo-European languages a contribution to the history of ideas
Chicago, Chicago University Press 1949
 Buku Referensi
Langenscheidt standard dictionary of the English and Spanish languages
Berlin Hodder and Stoughton 1966
 Buku Referensi
Porter, Andrew
European imperialism, 1860-1914
London: MacMillan, 1994
 Buku Teks