Cita APA (7a ed.)

Demkov, I. N. (1963). Variational principles in the theory of collisions (1a ed.). Pergamon Press Ltd.

Cita Chicago Style (17a ed.)

Demkov, I︠U︡. N. Variational Principles in the Theory of Collisions. 1a ed. Oxford: Pergamon Press Ltd, 1963.

Cita MLA (9a ed.)

Demkov, I︠U︡. N. Variational Principles in the Theory of Collisions. 1a ed. Pergamon Press Ltd, 1963.