APA (7th ed.) Citation

Elen, L. W. F. (1965). Differential equations, Part 1. Macmillan.

Chicago Style (17th ed.) Citation

Elen, L. W. F. Differential Equations, Part 1. London: Macmillan, 1965.

MLA (9th ed.) Citation

Elen, L. W. F. Differential Equations, Part 1. Macmillan, 1965.