APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.