Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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

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