APA Format
28185. (1997). The 80 / 20 principle. Jakarta : Bhuana Ilmu Populer
MLA Format
28185. The 80 / 20 principle. Jakarta : Bhuana Ilmu Populer, 1997
Chicago Format
28185. The 80 / 20 principle. Jakarta : Bhuana Ilmu Populer, 1997
Australian/Harvard Format
28185. 1997. The 80 / 20 principle. Bhuana Ilmu Populer Jakarta