Regardless of the industry, knowledge sharing has a direct bearing on success and productivity. Knowledge sharing contributes to an organization’s competitive value, culture, innovation and knowledge creation. This study explores knowledge sharing behavior from the theoretical framework of Albert Bandura’s self-efficacy theory, a subset of Bandura’s social cognition theory. This study follows a qualitative exploratory method from semi-structured interviews with 15 Drupal contributors. Drupal’s selection as the community of study is justifiable since as a community, it is analogous to traditional organizations mirroring Edgar Schein’s three levels of organizational culture represented by artifacts, espoused values, and basic assumptions. The Drupal community is a mature organization that is dependent upon knowledge sharing beyond the traditional motivational influencers of extrinsic reward systems. The Drupal community provides an opportunity to explore knowledge sharing motivation and self-efficacy theory through Bandura’s Four Source Model in order to gain an understanding of self-efficacy as an attribute that influences workers to share what they know, and thus improve an organization’s productivity, culture, innovation, creativity, and competitive value. This study reaffirms Bandura’s SET through the revelation of the dominant source themes of emotional and physiological states and verbal persuasion as a compelling framework toward a deeper understanding of knowledge sharing motivation. The study also reveals sentiments of enjoyment and commitment that influence positive knowledge sharing attitudes resulting in workplace job satisfaction.