by American Asociation of State Highway and Transportation Officials $9.00
by Gardner Franklin P; R. Brent Pearce dan Roger L. Mitchell $7.00
by Khalid Abdul Mu'thi Khalif $13.00
by Prof. Yogianto Hartono, MBA $9.00
by FX. E. Armada Riyanto, CM $6.00
by WK $11.00
by Purwohudojo. S $5.00
by Van Steenis $12.00
by $7.00
by WK $16.00
by Rinto Habsari $13.00
by ZAENAL RADAR T. $6.00
