APA (7th ed.) Citation

Robertson, N., & Sams, K. I. (1972). British trade unionism: Select documents. Blackwell.

Chicago Style (17th ed.) Citation

Robertson, N., and K. I. Sams. British Trade Unionism: Select Documents. Oxford: Blackwell, 1972.

MLA (9th ed.) Citation

Robertson, N., and K. I. Sams. British Trade Unionism: Select Documents. Blackwell, 1972.