HJ (1991). Fundamentals of item response theory. Hambleton, R. K. & Swaminathan, H. R Newbury Park, California: Sage Publications.
bibtex   
@book{hambleton_hj_nodate,
	title = {{HJ} (1991). {Fundamentals} of item response theory},
	publisher = {Newbury Park, California: Sage Publications},
	author = {Hambleton, R. K. and Swaminathan, H. R}
}
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