APA (7th ed.) Citation

Poppescu, N., & Popescu, L. (1979). Theory of categories. Academiei.

Chicago Style (17th ed.) Citation

Poppescu, Nicolae, and Liliana Popescu. Theory of Categories. Bucarest: Academiei, 1979.

MLA (9th ed.) Citation

Poppescu, Nicolae, and Liliana Popescu. Theory of Categories. Academiei, 1979.