Mutiara, Piala, 		Sitohang, Rasmi, 		Mariaty, Linda, 		Purba, Johana, AND 		Marpaung, Nalom.
" PELAYANAN PRIMA JASA HOTEL CAMBRIDGE MEDAN" <em>PKM Maju UDA</em> [Online], Volume 5 Number 1 (16 February 2024)