Παραπομπή σε μορφή APA (7η εκδ.)

Erugin, N. P., & Bellman, R. (1966). Linear systems of ordinary differential equations: With periodic and quasi-periodic coefficients. Academic Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Erugin, N. P., και Richard Bellman. Linear Systems of Ordinary Differential Equations: With Periodic and Quasi-periodic Coefficients. New York ; London: Academic Press, 1966.

Παραπομπή σε μορφή MLA (9th εκδ.)

Erugin, N. P., και Richard Bellman. Linear Systems of Ordinary Differential Equations: With Periodic and Quasi-periodic Coefficients. Academic Press, 1966.