by RW. Allard $11.00
by Harry Simons $12.00
by Datje Rahajoekoesoemah $42.00
by Gazalba Saleh, S.H. M.H $9.00
by Drs. H. Burhanuddin Salam, M.M $7.00
by Prof. Dr. Suharsimi Arikunto $11.00