Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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