APA aipamena

Ark, L. v. d., Ligtvoet, R., Marvelde, J. M. t., & Sijtsma, K. Investigating an invariant item ordering for polytomously scored items.

Chicago Style aipamena

Ark, L.Andries van der., Rudy Ligtvoet, Janneke M. te Marvelde, và Klaas Sijtsma. Investigating an Invariant Item Ordering for Polytomously Scored Items.

MLA aipamena

Ark, L.Andries van der., Rudy Ligtvoet, Janneke M. te Marvelde, và Klaas Sijtsma. Investigating an Invariant Item Ordering for Polytomously Scored Items.