Gaya APA
Maidl, B. et al (2013).
HANDBOOK OF TUNNEL ENGINEERING Volume I : Structures and Methods .
yogyakarta:
Wilhem Ernst & Sohn.
Gaya MLA
Maidl, Bernhard. et al.
"HANDBOOK OF TUNNEL ENGINEERING Volume I : Structures and Methods".
yogyakarta:
Wilhem Ernst & Sohn,
2013.
Text.