Philippines (Commonwealth) Office of Adult Education & Philippines (Republic). Division of Adult Education. (1939). Philippine adult education series. Booklet no. 9- ([Tagalog language ed.].). Bureau of Print.
Chicago-viite (17. p.)Philippines (Commonwealth) Office of Adult Education ja Philippines (Republic). Division of Adult Education. Philippine Adult Education Series. Booklet No. 9-. [Tagalog language ed.]. Manila: Bureau of Print, 1939.
MLA-viite (9. p.)Philippines (Commonwealth) Office of Adult Education ja Philippines (Republic). Division of Adult Education. Philippine Adult Education Series. Booklet No. 9-. [Tagalog language ed.]. Bureau of Print, 1939.
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