APA (7th ed.) Citation

Lichtman, A. (2012). The first theorem of Andrey Roiter. Algebra and Discrete Mathematics.

Chicago Style (17th ed.) Citation

Lichtman, A.I. "The First Theorem of Andrey Roiter." Algebra and Discrete Mathematics 2012.

MLA (8th ed.) Citation

Lichtman, A.I. "The First Theorem of Andrey Roiter." Algebra and Discrete Mathematics, 2012.

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