Gaya APA
Liang, D, O., Urwick, L, F.
(1962).
Pola management
.
Djakarta:
Djaja Sakti.
Gaya MLA
Liang, Drs., Oey., Urwick, Lyndall, F..
"Pola management".
Djakarta:
Djaja Sakti,
1962.
.