Citazione APA

Schrampfer Azar, B., & Stacy A Hagen. (2011). Fundamentals of English grammar: Volume B (4.). Pearson Education.

Stile di citazione Chicago

Schrampfer Azar, Betty, e Stacy A Hagen. Fundamentals of English Grammar: Volume B. 4. San José, C.R.: Pearson Education, 2011.

Citazione MLA

Schrampfer Azar, Betty, e Stacy A Hagen. Fundamentals of English Grammar: Volume B. 4. Pearson Education, 2011.