APA-viite

Balakrishnan, A. V. (1969). Control theory and the calculus of variations. Academic press.

Chicago-tyylinen lähdeviittaus

Balakrishnan, A V. Control Theory and the Calculus of Variations. New York: Academic press, 1969.

MLA-viite

Balakrishnan, A V. Control Theory and the Calculus of Variations. Academic press, 1969.