Gaya APA

Progress, G., Saepuddin, A. (1979). The Graying Of Working America The Coming Crisis In Retirement-Age Policy (First Edition). Kebumen: Widyatamma.

Gaya MLA

Progress, Ganesha., Saepuddin, Asep. "The Graying Of Working America The Coming Crisis In Retirement-Age Policy". First Edition Kebumen: Widyatamma, 1979. Text.