Ensiklopedi Indonesia - ENSIKLOPEDI... (Ichtiar Baru Van Hoeve, 1980)
Oen, Jil.1=c.1 Jil.2=c.1; Jil.3=c.1-2; Jil.4=c.1-2; Jil.5=c.1; Jil.6=c.1-3; Jil.7=c.1-2