@techreport {
	title = {Concept Guide on Reusable Learning Objects with  Application to Soil, Water and Environmental Sciences},
	author = {Grunwald, Sabine and Reddy, Ramesh K.},
	year = {2007},
	month = {12/2007},
	language = {en},
	pages = {1-13},
	url = {http://oerasia.org/OERResources/4.pdf},
	attachments = {4.pdf},
}