Puspita, Yesi, 		Kusumaningputri, Reni, AND 		Supriono, Hari.
" LEVEL AND SOURCES OF SELF-EFFICACY IN SPEAKING SKILLS OF ACADEMIC YEAR 2012/2013 ENGLISH DEPARTMENT STUDENTS FACULTY OF LETTERS, JEMBER UNIVERSITY (TINGKATAN DAN SUMBER EFIKASI DIRI DALAM KEMAMPUAN BERBAHASA INGGRIS MAHASISWA SASTRA INGGRIS ANGKATAN 2012/" <em>Publika Budaya</em> [Online], Volume 3 Number 1 (25 June 2015)