Gaya APA
Thomas, Alun. ().
Sprayed Concrete Lined Tunnels : Second Edition (Second).
:
.
Gaya Chicago
Thomas, Alun.
Sprayed Concrete Lined Tunnels : Second Edition.
Second
:
,
.
Electronic Resource.
Gaya MLA
Thomas, Alun.
Sprayed Concrete Lined Tunnels : Second Edition.
Second
:
,
.
Electronic Resource.
Gaya Turabian
Thomas, Alun.
Sprayed Concrete Lined Tunnels : Second Edition.
Second
:
,
.
Electronic Resource.