KEESING, R.M & A.J. STRATHERN 1998. Cultural anthropology: a contemporary perspective. Fort Worth: Harcourt Brace College Publisher.
Where you have three or more authors, the in-text citation includes the surname of the first listed author followed by et al., meaning "and others". The Reference List entry should include the details of all the authors.
In-text citation: (Surname et al. year: page number).