@incollection{Todorova12, author = {Donika Valcheva and Margarita Todorova}, title = {Methods and Tools for Increasing the Effectiveness of E-Learning}, booktitle = {Methodologies, Tools and New Developments for E-Learning}, publisher = {IntechOpen}, address = {Rijeka}, year = {2012}, editor = {Elvis Pontes and Anderson Silva and Adilson Guelfi and Sérgio Takeo Kofuji}, chapter = {4}, doi = {10.5772/28615}, url = {https://doi.org/10.5772/28615} }