Buku Kongres ke-VI IKAPI O.P.S. Penerbitan Tretes tanggal 13-17 Mei 1968. 

 - [Djakarta] :  Pengurus Umum IKAPI O.P.S. Penerbitan,  [1968] 
 - 139, 63 leaves ;  32 cm. 
<br/><br/><label>LCCN: </label>sa 68019025  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Publishers and publishing--Indonesia--Congresses.
<br/><br/><label>LC Class. No.: </label>Z460.7  / .I35