, S., & , P. M. (1991). Studi komparasi teknik pengukuran sikap: : Equal Appearing Intervals, Summated Ratings dan Skala Likert. [Yogyakarta] : Universitas Gadjah Mada.
Chicago Style Citation, SUPRIYADI, and Prof.Dr. Masrun. Studi Komparasi Teknik Pengukuran Sikap: : Equal Appearing Intervals, Summated Ratings Dan Skala Likert. [Yogyakarta] : Universitas Gadjah Mada, 1991.
MLA引文, SUPRIYADI, and Prof.Dr. Masrun. Studi Komparasi Teknik Pengukuran Sikap: : Equal Appearing Intervals, Summated Ratings Dan Skala Likert. [Yogyakarta] : Universitas Gadjah Mada, 1991.
警告：這些引文格式不一定是100％准確.