Judul asli : "Principles of Geotechnical Engineering"
No Inv.: 3460-3469/P/Perp/98/10c
Judul asli : "Physical and Geotechnical Properties of Soils"
No Inv.: 88750/P/Perp/04/1c
No Inv.: 88966-88968/P/Perp/3c
No Inv.: 106522-106523/P/Perp/06/2c
Judul asli : "Introduction to the Study of Soils in Tropical and Subtropical Regions"