Polytomous Item Response Theory Models. Ostini, D. R. & Nering, D. M. L. Sage Publications, Inc, August, 2005.
bibtex   
@book{ostini_polytomous_2005,
	title = {Polytomous {Item} {Response} {Theory} {Models}},
	isbn = {0-7619-3068-X},
	publisher = {Sage Publications, Inc},
	author = {Ostini, Dr. Remo and Nering, Dr. Michael L.},
	month = aug,
	year = {2005}
}
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