Footnotes:
APA does not use footnotes. Inline citations are the only option and require the author and date of publication instead of a page number (Cozart, 1982). It goes inside the period. This is true even when there are "quotation marks" (Jones, 7).
It can also be placed inside a sentence, disrupting the flow of reading (Smith, 1945) even further. One feature of APA that is interesting is that you can skip the whole citation by mentioning the author or title directly in the sentence. For example, Meriwether Lewis (1804) believed there were thousands of new plants to be discovered in the new acquired territory.
While page numbers are one of the most important aspects of a citation, enabling a reader to find the source, they are not a requirement of APA style.
Example:
Footnote: (Jerrentrup, et al., 2018)
Bibliographic notation:
Jerrentrup, A., Mueller, T., Glowalla, U., Herder, M., Henrichs, N., Neubauer, A., & Schaefer, J. R. (2018). Teaching medicine with the help of “Dr. House.” PLoS ONE, 13(3), Article e0193972. https://doi.org/10.1371/journal.pone.0193972