% Webpage with lastchecked and date
@webpage{url:latex,
  author = {Barbara Beeton},
  year = 2001,
  month = may,
  url = {http://www.tug.org/docs/html/ptr-faq.html},
  title = {What is {\TeX}?},
  lastchecked = {20 August 2001}
}

% Webpage with lastchecked but no date
@webpage{url:iso690,
  author = {{International Standards Organisation}},
  title = {{ISO 690-2}},
  url = {http://www.nlc-bnc.ca/iso/tc46sc9/standard/690-2e.htm},
  lastchecked = {20 August 2001}
}

% Webpage with date but no lastchecked
@Webpage{classroom96,
  title =	 {Citing Internet Addresses: how students should
                  reference online sources in their bibliographies},
  year =	 1996,
  month =	 mar,
  key = 	 {Classroom},
  url = "http://www.classroom.net/classroom/CitingNetResources.html"
}

% Webpage with neither date nor lastchecked
@Webpage{emory95,
  author =	 "libsf@web.cc.emory.edu",
  title =	 "Citation Formats",
  url =		 "http://www.cc.emory.edu/WHSCL/citation.formats.html"
}

% Article with URL and lastchecked
@article{url:towell,
  title = 	 {Presence in Text-Based Networked Virtual
                  Environments or `{MUDs}'},
  author =	 {John Towell and Elizabeth Towell},
  journal = 	 {Presence},
  volume = 	 6,
  number = 	 5,
  pages = 	 {590-595},
  year =	 1997,
  url = 	 {http://www-unix.mcs.anl.gov/~towell/presence.html},
  lastchecked =	 {13 February 2002}
}

% Book with URL, lastchecked, and note.
@Book{raymond99,
  author =	 {Eric S Raymond},
  title = 	 {The Cathedral and the Bazaar},
  publisher = 	 {O'Reilly},
  year = 	 1999,
  url =		 {http://www.tuxedo.org},
  isbn =	 {1-56592-724-9},
  lastchecked =  {1 April 2002},
  note = 	 {The seminal book on the commercialisation of open-source}
}

% Plain book, no URLs at all
@book{laurillard93,
  author = 	 {Diana Laurillard},
  title = 	 {Rethinking University Teaching},
  publisher = 	 {Routledge},
  year = 	 1993
}