How do I refer to sources with multiple authors, in an in-text citation and reference list?

Two authors are both mentioned in the text and reference list. For three or more authors, only the first name is mentioned in the text + et al. (Latin abbreviation for et alii = and others). In the reference list, all names are mentioned, up to a maximum of 20 authors. For 21 or more authors, the first 19 names are mentioned, followed by the impediment with spaces (. . .) and the last name.

Bennett, A., & Royle, N. (2024). This thing called literature: Reading, thinking, writing (2nd edition). Routledge.

Parenthetical citation: (Bennet & Royle, 2024)
Narrative citation: Bennet and Royle (2024)

Shumway-Cook, A., Woollacott, M. H., Rachwani, J., & Santamaria, V. (2024). Motor control: Translating research into clinical practice. Wolters Kluwer.

Parenthetical citation: (Shumway-Cook et al., 2024)
Narrative citation: Shumway-Cook et al. (2024)

Korematsu, S., Fujisawa, T., Saito, N., Tezuka, J., Miura, K., Kobayashi, I., Miyata, I., Kosugi, Y., Gohda, Y., Koike, Y., Suda, A., Matsuo, A., Sasaki, M., Handa, Y., Fujiwara, M., Ono, A., Koizumi, S., Oishi, T., Tanaka, T., Ando, Y., . . . Okada, K. (2024). Suppressed pediatric asthma hospitalizations during the COVID-19 pandemic in Japan, from a national survey. Clinical and Translational Allergy, 14(1), e12330. https://doi.org/10.1002/clt2.12330

Parenthetical citation: (Korematsu et al., 2024)
Narrative citation: Korematsu et al. (2024)