APA Style is a form of writing style that guides writers in terms of abbreviations, citing references, punctuations, presenting graphs and tables, outlining, and many more. Its purpose is to organize the way of writing into one convention for the ease of reading comprehension.
In one of its rules, when there are multiple authors to a reference, you can just cite at least two of the main authors, followed by 'et al'. The phrase 'et al' is an abbreviation of et alia which means 'and others'. For example, you should cite the reference as "Apollo, Amsterdam, et al."