APA (7th ed.) Citation

Walker, E., & Elsworth, S. (1989). Blueprint intermediate: Workbook.

Chicago Style (17th ed.) Citation

Walker, Elaine, and Steve Elsworth. Blueprint Intermediate: Workbook. Harlow, 1989.

MLA (9th ed.) Citation

Walker, Elaine, and Steve Elsworth. Blueprint Intermediate: Workbook. 1989.

Warning: These citations may not always be 100% accurate.