Caballa, G. C. P., & Echiverra, R. G. (2013). Pakikisama and the relationship of self-efficacy and work productivity among male sales employees from fast moving consumer goods and real estate industries in Pampanga. University of the Philippines Diliman Extension Program in Pampanga.
Chicago-referens (17:e uppl.)Caballa, Gia Carmel P., och Rosanne Galvez Echiverra. Pakikisama and the Relationship of Self-efficacy and Work Productivity Among Male Sales Employees from Fast Moving Consumer Goods and Real Estate Industries in Pampanga. Pampanga: University of the Philippines Diliman Extension Program in Pampanga, 2013.
MLA-referens (9:e uppl.)Caballa, Gia Carmel P., och Rosanne Galvez Echiverra. Pakikisama and the Relationship of Self-efficacy and Work Productivity Among Male Sales Employees from Fast Moving Consumer Goods and Real Estate Industries in Pampanga. University of the Philippines Diliman Extension Program in Pampanga, 2013.