by Prof. Dr. Simuh $7.00
by MUSA KAZHIM & ALFIAN HAMZAH $6.00
by Adzimattinur Siregar $6.00
by Dr. K.H. Didin Hafidudin $12.00
by $6.00
by Dr. Ir. M\'Imadduddin Abdul Rahim, M.Sc $6.00