L-Islami, C.B., Rustono, R. and Haryadi, H. 2021. Directive Functions of The Letters of Prophet Muhammad Pbuh for The Kings and The Warlords. Seloka: Jurnal Pendidikan Bahasa dan Sastra Indonesia. 10, 2 (Aug. 2021), 168-170. DOI:https://doi.org/10.15294/seloka.v10i3.49508.