APA (7th ed.) Citation

Popescu, . N., Popescu, . L., Boron, . L. F., & Christenson, . C. O. (1979). Theory of categories. Editura Academiei.

Chicago Style (17th ed.) Citation

Popescu, Nicolae, Liliana Popescu, Leo F. Boron, and Charles O. Christenson. Theory of Categories. Bucuresh: Editura Academiei, 1979.

MLA (9th ed.) Citation

Popescu, Nicolae, et al. Theory of Categories. Editura Academiei, 1979.