APA-referens (7:e uppl.)

Opetina, L. N. (2007). Grammar at work for college freshmen. Mindshapers.

Chicago-referens (17:e uppl.)

Opetina, Leandro N. Grammar at Work for College Freshmen. Manila: Mindshapers, 2007.

MLA-referens (9:e uppl.)

Opetina, Leandro N. Grammar at Work for College Freshmen. Mindshapers, 2007.