APA Style
PKK, P, D, D, A, , M. (2021).
Varian Delta Waspada Penularan Covid-19 (2021).
Jogjakarta:
arruzz media.
MLA Style
PKK, Prof., Dr., Dr., Anies,, , M.Kes,.
"Varian Delta Waspada Penularan Covid-19".
2021
Jogjakarta:
arruzz media,
2021.
Buku Umum.