APA citiranje

Salle, J. L., & Lefschetz, S. (1961). Stability by Liapunov's direct method: With applications. New York: Academic Press.

Trích dẫn kiểu Chicago

Salle, Joseph La., và Solomon Lefschetz. Stability By Liapunov's Direct Method: With Applications. New York: Academic Press, 1961.

MLA citiranje

Salle, Joseph La., và Solomon Lefschetz. Stability By Liapunov's Direct Method: With Applications. New York: Academic Press, 1961.