Arroyo, S. R. (1987). English for college freshmen. Rex Book Store.
Lua i Stíl Chicago (17ú heag.)Arroyo, Sandra Rodriguez. English for College Freshmen. Manila: Rex Book Store, 1987.
Lua MLA (9ú heag.)Arroyo, Sandra Rodriguez. English for College Freshmen. Rex Book Store, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.