APA Style
Competition among producers of concrete roof tiles. (13 October 1997).
:
.
Chicago Style
Competition among producers of concrete roof tiles.
.
:
,
13 October 1997.
.
MLA Style
Competition among producers of concrete roof tiles.
.
:
,
13 October 1997.
.
Turabian Style
Competition among producers of concrete roof tiles.
:
,
13 October 1997.
.