APA (7th ed.) Citation

Walton, C. (1977). A Philippine language tree. Summer Institute of Linguistics.

Chicago Style (17th ed.) Citation

Walton, Charles. A Philippine Language Tree. [Manila]: Summer Institute of Linguistics, 1977.

MLA (9th ed.) Citation

Walton, Charles. A Philippine Language Tree. Summer Institute of Linguistics, 1977.

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