APA (7th ed.) Citation

Ostini, R., & Nering, M. L. (2006). Polytomous item response theory models. SAGE.

Chicago Style (17th ed.) Citation

Ostini, Remo, and Michael L. Nering. Polytomous Item Response Theory Models. Thousand Oaks, [Calif.] ; London: SAGE, 2006.

MLA (9th ed.) Citation

Ostini, Remo, and Michael L. Nering. Polytomous Item Response Theory Models. SAGE, 2006.