APA (7th ed.) Citation

Sikorski, R. (1969). Advanced calculus: Functions of several variables. PWN Polish scientific publishers.

Chicago Style (17th ed.) Citation

Sikorski, Roman. Advanced Calculus: Functions of Several Variables. Warszawa: PWN Polish scientific publishers, 1969.

MLA (8th ed.) Citation

Sikorski, Roman. Advanced Calculus: Functions of Several Variables. PWN Polish scientific publishers, 1969.

Warning: These citations may not always be 100% accurate.