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Specific problem: referencing the webpage for Sigsbee.
These guys have a solution for bibtex- a python script that modifies your bst file.

http://www.tex.ac.uk/tex-archive/biblio/bibtex/contrib/urlbst/

then you can add


@Webpage{sigs,
  url={http://www.delphi.tudelft.nl/SMAART},
  author={J[] V[] {SMAART}},
  year={2002},
  lastchecked={26 June 2009},
  note={Joint Venture consisting of BHP Billiton, BP and ChevronTexaco}
}

to get :
SMAART, [online]. (2002). Joint Venture consisting of BHP Billiton, BP and ChevronTex- 
aco. Available from: http://www.delphi.tudelft.nl/SMAART [cited 26 June 2009]. 


However, it also inserts DOI and such for every other thing in your .bib file that has one.
Dellinger, J. A., B. Nolte, and J. T. Etgen, 2001, Alford rotation, ray the- 
ory, and crossed-dipole geometry: Geophysics, 66, 637–647. Available from: 
http://link.aip.org/link/?GPY/66/637/1, doi:10.1190/1.1444954. 

So, Geophysics/Geophysical Prospecting have standards yet on including doi's?