APA (7th ed.) Citation

Kajak, Z., & Hillericht-Ilkowska, A. (1972). Productivity problems of freshwaters ([1st ed.].). Polish Scientific Publishers.

Chicago Style (17th ed.) Citation

Kajak, Z., and A. Hillericht-Ilkowska. Productivity Problems of Freshwaters. [1st ed.]. Warszawa: Polish Scientific Publishers, 1972.

MLA (9th ed.) Citation

Kajak, Z., and A. Hillericht-Ilkowska. Productivity Problems of Freshwaters. [1st ed.]. Polish Scientific Publishers, 1972.