“Pricing and Promotion Strategies for Hotel Room Occupancy Rates at Niagara Parapat Hotel, Girsang Sipangan Bolon District, Simalungun Regency, North Sumatra”. Maneggio 2, no. 5 (October 20, 2025): 141–151. Accessed November 30, 2025. https://ejournal-nawalaedu.com/index.php/MJ/article/view/2030.