APA (7th ed.) Citation

Elen, L. W. (1967). Differential equations. Macmillan [u.a.].

Chicago Style (17th ed.) Citation

Elen, Leonard W. Differential Equations. London [u.a.]: Macmillan [u.a.], 1967.

MLA (9th ed.) Citation

Elen, Leonard W. Differential Equations. Macmillan [u.a.], 1967.