Cita APA (7a ed.)

Logan, J. D. (1977). Invariant variational principles. Academic Press.

Cita Chicago Style (17a ed.)

Logan, J. David. Invariant Variational Principles. New York: Academic Press, 1977.

Cita MLA (8a ed.)

Logan, J. David. Invariant Variational Principles. Academic Press, 1977.