Cita APA (7th ed.)
Walker, E., & Elsworth, S. (1989). Blueprint intermediate: Workbook. Longman.
Cita Chicago (17th ed.)
Walker, Elaine, i Steve Elsworth. Blueprint Intermediate: Workbook. England: Longman, 1989.
Cita MLA (9th ed.)
Walker, Elaine, i Steve Elsworth. Blueprint Intermediate: Workbook. Longman, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.