APA (7th ed.) Citation

Köbler, J., Schöning, U., & Wagner, K. W. (1986). The difference and truth-table hierarchies for NP.

Chicago Style (17th ed.) Citation

Köbler, Johannes, Uwe Schöning, and Klaus W. Wagner. The Difference and Truth-table Hierarchies for NP. Koblenz, 1986.

MLA (9th ed.) Citation

Köbler, Johannes, et al. The Difference and Truth-table Hierarchies for NP. 1986.