Kasri Astuti, Rahmania Ambarika. Effectiveness Of The “Ular Tangga” Method Against The Motivation And Activeness Of The Class Of Pregnant Women In Ngepoh Village Dringu Subdistrict, Probolinggo Regency. Jour. H.M. Servic. [Internet]. 2020 May 25 [cited 2025 Sep. 13];2(1):12-21. Available from: http://www.thejhms.org/index.php/JHMS/article/view/87