Ahhh Girl on Beatley Moments

I'm helping a student with a citation question, and this is a example we just found:

One Work by Three, Four, or Five Authors
For the first text citation of a work by three to five authors cite all authors.  For all subsequent citations, include only the surname of the first author followed by et al. If the work is cited more than once within the same paragraph, omit the year after the first citation.

1^st Citation:
     Lennon, McCartney, Starr, and Harrison (1969) noted in their research…
2^nd Citation (and further citations):
     ...