Gaya APA
Wittke, W.. (1977).
New design concept for underground opening in rock .
:
John Wiley And Sons.
Gaya Chicago
Wittke, W..
New design concept for underground opening in rock.
:
John Wiley And Sons,
1977.
Text.
Gaya MLA
Wittke, W..
New design concept for underground opening in rock.
:
John Wiley And Sons,
1977.
Text.
Gaya Turabian
Wittke, W..
New design concept for underground opening in rock.
:
John Wiley And Sons,
1977.
Print.