APA (7th ed.) Citation

Logan, J. D. (1977). Invariant variational principles. Acad. Pr.

Chicago Style (17th ed.) Citation

Logan, J. David. Invariant Variational Principles. New York u.a: Acad. Pr, 1977.

MLA (9th ed.) Citation

Logan, J. David. Invariant Variational Principles. Acad. Pr, 1977.