A research paper published by an organization: American Psychological Association. (2002). Cognitive development in 16-month-old infants. Psychology and Neuroscience, 12, pp. 340-342. Multiple papers by the same author: Bart, D.C. (2005). Infant cognition and extraversion. Psychology Today, 12, 144-146. Bart, D.C. (2006). Personality types in infants. Psychology Today, 15, 31-35. Multiple papers by the same author, published in the same year: Carpenter, K. (2008a). Personality development and attention. Psychology and Neuroscience, 11, pp. 50-56. Carpenter, K. (2008b). Introduction. In R.M. Quong (Ed.), Introduction to Infancy Psychology (pp. 1-7). New York: Bronwyn and Bronwyn. A research paper by two authors: David, Q., & Smith, R.T. (1980). Attention in infants under 16 months. Journal of Infant Psychology, 78, 20-5. A research paper by more than two authors: Evans, H., Cameron, T.C., Joyce, Y.I., Berry, H.G., & Smith, O.B. (2017). Extraversion as a predictor of cognitive ability. Infancy and Child Development, 85, 33-40. A research paper published in an edited edition of a book: Grant, Y. (1988). A cross-sectional study of infant attention. In A.T. Bloomberg & G.S. Yu (Ed.), Infancy (pp. 91-93). Toronto: University of Toronto Press. A research paper found online with a DOI: Ip, K.P. (2007). Testing for introversion and extraversion in infants. The Scientist, 45, 400-402. doi:10.17389/0989.2007.05.006 A research paper found online with an unknown DOI: Kwan, S.M. (2016). Evidence-based parenting of introverted infants. Journal of Childhood Psychology, 18. Retrieved from http://www.jcp.isk.org/jto/odk.html An unpublished research paper (such as a thesis): Herbert, L.K. (2018). Parenting and Infant Personality. University of British Columbia, Vancouver, B.C.