When static media promote active learning: annotated illustrations versus narrated animations in multimedia instruction
Journal of Experimental Psychology Applied (2005) - Comment
pubmed: 16393035  doi: 10.1037/1076-898x.11.4.256  issn: 1939-2192  issn: 1076-898x 

Richard E. Mayer, Mary Hegarty, Sarah Mayer, Julie Campbell