Mweetwa, Larry, Derrick D Tlhoiwe, Tumelo Tlhoiwe, Kabo Osmas Tshiamo, Sody Mweetwa Munsaka, Thatoyaone J Kenaope, Getrude Mothibe, Ogorogile Mokate, & Emmanuel T Oluwabusola. " Development of first Generation COVID-19 Vaccines: State-of the-Art Technologies and future Implications!." Medical Research Archives [Online], 10.9 (2022): n. pag. Web. 6 Nov. 2024