APA (7th ed.) Citation

Puerto Rico. Department of Education, Rojas, P. M., Fries, C. C., & Hull, A. L. (1952). Fries American English series, for the study of English as a second language. Heath.

Chicago Style (17th ed.) Citation

Puerto Rico. Department of Education, Pauline Martz Rojas, Charles Carpenter Fries, and Adrian L. Hull. Fries American English Series, for the Study of English as a Second Language. Boston: Heath, 1952.

MLA (9th ed.) Citation

Puerto Rico. Department of Education, et al. Fries American English Series, for the Study of English as a Second Language. Heath, 1952.