Gaya APA

Officials, A, A, O, S, H, A, T. (2010). Technical Manual for Design and Construction of Road Tunnels - Civil Elements . : AASHTO.

Gaya MLA

Officials, American, Assosiation, Of, State, Highway, And, Transportation. "Technical Manual for Design and Construction of Road Tunnels - Civil Elements". : AASHTO, 2010. Text.