Cita APA (7th ed.)

Steenrod, N. E., & Epstein, D. B. A. (1962). Cohomology operations. Princeton University.

Cita Chicago (17th ed.)

Steenrod, N. E., i D. B. A. Epstein. Cohomology Operations. Princeton: Princeton University, 1962.

Cita MLA (9th ed.)

Steenrod, N. E., i D. B. A. Epstein. Cohomology Operations. Princeton University, 1962.