Default: none, this field *must* be given 0, 'article', 'An article from a journal or magazine.' 1, 'book', 'A book with an explicit publisher.' 2, 'booklet', 'A work that is printed and bound, but without a named publisher or sponsoring institution' 3, 'inbook', 'A part of a book, which may be a chapter and/or a range of pages.' 4, 'incollection', 'A part of a book with its own title.' 5, 'inproceedings', 'An article in a conference proceedings.' 5, 'conference', 'Same as "inproceedings". Kept for historical reasons.' 6, 'manual', 'Technical documentation. If a manual is published by a publishing company, type "book" should be used.' 7, 'mastersthesis', 'A Master\'s or Diploma thesis.' 8, 'misc', 'Use this type when nothing else fits.' 9, 'phdthesis', 'A Ph.D. thesis.' 10, 'proceedings', 'The proceedings of a conference.' 11, 'techreport', 'A report published by a school or other institution or organization, ususally numbered within a series.' 12, 'unpublished', 'A document with an author and title, but not formally published.' 13, 'software', 'A piece of software.' 14, 'riscreport', 'A techreport from the RISC-Linz technical report series.' 15, 'collection' The editor is given as author