APA (7th ed.) Citation

Webb, P. J., & Peirce, J. R. (1992). TRRL PICADY/3 user guide (2nd ed.). TRRL.

Chicago Style (17th ed.) Citation

Webb, P. J., and J. R. Peirce. TRRL PICADY/3 User Guide. 2nd ed. Crowthorne, Berkshire, U.K.: TRRL, 1992.

MLA (9th ed.) Citation

Webb, P. J., and J. R. Peirce. TRRL PICADY/3 User Guide. 2nd ed. TRRL, 1992.