Proceedings of the institution of civil engineers September 1957.
Chicago-čujuhus (17. p.)Proceedings of the Institution of Civil Engineers September 1957.
MLA-čujuhus (9. p.)Proceedings of the Institution of Civil Engineers September 1957.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.