APA (7th ed.) Citation

Walker, E., & Elsworth, S. (1991). Blueprint intermediate. Workbook. Longman.

Chicago Style (17th ed.) Citation

Walker, Elaine, and Steve Elsworth. Blueprint Intermediate. Workbook. Harlow: Longman, 1991.

MLA (9th ed.) Citation

Walker, Elaine, and Steve Elsworth. Blueprint Intermediate. Workbook. Longman, 1991.

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