Gaya APA
Ruky, S, A. (1992).
Sistem manajemen Kinerja : Performance Management System .
Yogyakarta:
Media Widya Mandala.
Gaya MLA
Ruky, S., Achmad.
"Sistem manajemen Kinerja : Performance Management System".
Yogyakarta:
Media Widya Mandala,
1992.
Textbook.