APA (7th ed.) Citation

Stewart, I. A. (1991). Refining known results on the generalized word problem for free groups.

Chicago Style (17th ed.) Citation

Stewart, Ian A. Refining Known Results on the Generalized Word Problem for Free Groups. Newcastle upon Tyne, 1991.

MLA (9th ed.) Citation

Stewart, Ian A. Refining Known Results on the Generalized Word Problem for Free Groups. 1991.

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