APA (7th ed.) Citation

Rasiowa, H., & Sikorski, R. (1968). The mathematics of metamathematics. Polish Scientific Publishers.

Chicago Style (17th ed.) Citation

Rasiowa, Helena, and Roman Sikorski. The Mathematics of Metamathematics. Varsovia: Polish Scientific Publishers, 1968.

MLA (9th ed.) Citation

Rasiowa, Helena, and Roman Sikorski. The Mathematics of Metamathematics. Polish Scientific Publishers, 1968.