Suryadi, Iwan, Siti Rachmawati, Tyas Lilia Wardani, and Ratna Fajariani. 2018. “PENERAPAN HYGIENE DAN SANITASI HOTEL GRAHA TIMOHO YOGYAKARTA”. Prosiding Sains Nasional Dan Teknologi 1 (1). https://doi.org/10.36499/psnst.v1i1.2299.