APA (7th ed.) Citation
Lefschets, S. (1950). Contributions to the theory of nonlinear oscllations. Princeton University Press.
Chicago Style (17th ed.) Citation
Lefschets, Solomon. Contributions to the Theory of Nonlinear Oscllations. Princeton: Princeton University Press, 1950.
MLA (9th ed.) Citation
Lefschets, Solomon. Contributions to the Theory of Nonlinear Oscllations. Princeton University Press, 1950.
Warning: These citations may not always be 100% accurate.