@article{article,
author  = {Peter Adams},
title   = {The title of the work},
journal = {The name of the journal},
year    = 1993,
number  = 2,
pages   = {201-213},
month   = 7,
note    = {An optional note},
volume  = 4
}

    @book{book,
        author    = {Peter Babington},
        title     = {The title of the work},
        publisher = {The name of the publisher},
        year      = 1993,
        volume    = 4,
        series    = 10,
        address   = {The address},
        edition   = 3,
        month     = 7,
        note      = {An optional note},
        isbn      = {3257227892}
        }

    @booklet{booklet,
          title        = {The title of the work},
          author       = {Peter Caxton},
          howpublished = {How it was published},
          address      = {The address of the publisher},
          month        = 7,
          year         = 1993,
          note         = {An optional note}
        }

    @conference{conference,
          author       = {Peter Draper},
          title        = {The title of the work},
          booktitle    = {The title of the book},
          year         = 1993,
          editor       = {The editor},
          volume       = 4,
          series       = 5,
          pages        = 213,
          address      = {The address of the publisher},
          month        = 7,
          organization = {The organization},
          publisher    = {The publisher},
          note         = {An optional note}
        }