Mitchell, L., Frank, M. R., Harris, K. D., Dodds, P. S., & Danforth, C. M. (2013). The Geography of Happiness: Connecting Twitter Sentiment and Expression, Demographics, and Objective Characteristics of Place. Public Library of Science.

Mitchell, Lewis, Morgan R. Frank, Kameron Decker Harris, Peter Sheridan Dodds, και Christopher M. Danforth. The Geography of Happiness: Connecting Twitter Sentiment and Expression, Demographics, and Objective Characteristics of Place. Public Library of Science, 2013.

Mitchell, Lewis, et al. The Geography of Happiness: Connecting Twitter Sentiment and Expression, Demographics, and Objective Characteristics of Place. Public Library of Science, 2013.