APA Style Guide: Book with three to twenty authors

When you have a source with two to twenty authors, include all the authors names, including an ampersand (&) preceded by a comma.

Reference: First Author Last name, Initials., Second Author Last name, Initials., Third Author Last name, Initials., Fourth Author Last name, Initials., & Fifth Author, Last name, Initials. (Year). Title. Publisher.

Example: Fennelly, M., Matthews,P. J., Morgan, L.,  Gilchrist, S., Wilson, E. T., & Bishop, R. (2014). Understanding child development. Birch Press.

In-Text-Citation (subsequently mentioned in-text):

• First Author Last name et al. (Year)
• (First Author Last name et al., Year)

Example:

• Fennelly et al. (2014) describe…
• It has been shown that children as young as two months can perceive changes in depth (Fennelly et al., 2014)...

Still unsure what in-text citation and referencing mean? Check here. 

Still unsure why you need to reference all this information? Check here.