Nongraded and mixed-age grouping in early childhood programs. Katz, L. G. ERIC Clearinghouse, 1992.
Nongraded and mixed-age grouping in early childhood programs [link]Paper  bibtex   
@book{katz_nongraded_1992-1,
	title = {Nongraded and mixed-age grouping in early childhood programs},
	url = {http://eric.ed.gov/?id=ED351148},
	publisher = {ERIC Clearinghouse},
	author = {Katz, Lilian G.},
	year = {1992}
}

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