Gaya APA
J., V, D, M, , W.
(1981).
Geotechnical Mapping, Aid to Environmental Control
.
:
A.A. Balkema.
Gaya MLA
J., Van, Der, Merwe,, , W..
"Geotechnical Mapping, Aid to Environmental Control".
:
A.A. Balkema,
1981.
Computer Software.