I Gst Ngr Rai Usadha, and Erika Eka Santi. 2005. “emodelan raktal: tudy asus ada ilai ukar olar merika erhadap upiah”. imits: ournal of athematics and ts pplications 2 (1):27. https://journal.its.ac.id/index.php/limits/article/view/5308.