المؤلفون: Mattox, Steve, Bridenstine, Michelle, Burns, Bridget, Torresen, Emmeline, Koning, Alex, Meek, S. Paul, Ritchie, Matthew, Schafer, Neil, Shepard, Lindsay, Slater, Angela, Waters, Tamara, Wigent, Amanda

المصدر: Journal of Geoscience Education ; volume 56, issue 2, page 156-159 ; ISSN 1089-9995 2158-1428

الاتاحة: http://dx.doi.org/10.5408/1089-9995-56.2.156
https://www.tandfonline.com/doi/pdf/10.5408/1089-9995-56.2.156