@article {Heller:2012ih,
	title = {{Differential effects of three professional development models on teacher knowledge and student achievement in elementary science}},
	journal = {Journal of Research in Science Teaching},
	volume = {49},
	year = {2012},
	pages = {333{\textendash}362},
	author = {Heller, Joan I and Daehler, Kirsten R and Wong, Nicole and Shinohara, Mayumi and Miratrix, Luke W}
}
