APA Style

al.], F, S, ., [. (2021). Covid-19 : a pandemic . Surabaya: Surabaya: Airlanggga University Press,.

MLA Style

al.], Frans, Santosa, ..., [et.. "Covid-19 : a pandemic". Surabaya: Surabaya: Airlanggga University Press,, 2021. Teks.