APA (7th ed.) Citation

Gardner, B., & Parmenter, M. (2009). Some classes of directoid groups. Algebra and Discrete Mathematics.

Chicago Style (17th ed.) Citation

Gardner, B.J, and M.M Parmenter. "Some Classes of Directoid Groups." Algebra and Discrete Mathematics 2009.

MLA (8th ed.) Citation

Gardner, B.J, and M.M Parmenter. "Some Classes of Directoid Groups." Algebra and Discrete Mathematics, 2009.

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