APA (7th ed.) Citation

Frei, E. J. (1980). The historical development of the Philippine national language. AMS Press.

Chicago Style (17th ed.) Citation

Frei, Ernest J. The Historical Development of the Philippine National Language. New York: AMS Press, 1980.

MLA (9th ed.) Citation

Frei, Ernest J. The Historical Development of the Philippine National Language. AMS Press, 1980.