Cita APA (7a ed.)

Frei, E. J. (1950). The historical development of the Philippine national language V.

Cita Chicago Style (17a ed.)

Frei, Ernest J. The Historical Development of the Philippine National Language V. 1950.

Cita MLA (9a ed.)

Frei, Ernest J. The Historical Development of the Philippine National Language V. 1950.