APA (7th ed.) Citation

Olszak W., P. P. (1961). Extremum Theorems in General Viscoelasticity. Académie polonaise des sciences.

Chicago Style (17th ed.) Citation

Olszak W., Perzyna P. Extremum Theorems in General Viscoelasticity. Warszawa: Académie polonaise des sciences, 1961.

MLA (8th ed.) Citation

Olszak W., Perzyna P. Extremum Theorems in General Viscoelasticity. Académie polonaise des sciences, 1961.

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