Gaya APA
Soemantri, S. (1982).
Study of Indonesia Economically Active Population .
Yogyakarta:
Gajah Mada University Pess.
Gaya MLA
Soemantri, Soeharsono.
"Study of Indonesia Economically Active Population".
Yogyakarta:
Gajah Mada University Pess,
1982.
Text.