Citazione APA

Lefschetz, S. (1977). Differential equations: Geometric theory .-2nded. (2d ed.). Dover Publications.

Stile di citazione Chicago

Lefschetz, Solomon. Differential Equations: Geometric Theory .-2nded. 2d ed. New York: Dover Publications, 1977.

Citazione MLA

Lefschetz, Solomon. Differential Equations: Geometric Theory .-2nded. 2d ed. Dover Publications, 1977.