Entry types:

% article.

%  must: author, title, journal, year

%  opt: volume, number, pages, month, note

% book.

%  must: author or editor, title, publisher, year

%  opt: volume or number, series, address, edition, month, note

% misc.

%  must: none

%  opt: author, title, howpublished, month, year, note

@manual{jpegspec,

    title = "Information Technology -- Digital Compression and Coding of

        Continuous-Tone Still Images -- Requirements and Guidelines",

    organization = "ITU",

    note = "ITU. ISO/IEC 10918-1:1993(E). CCITT Rec. T.81 (1992 E)",

    month = "September",

    year = "1992"

}