2 Abstract
14 15
Non-English journal article
14 15 Published
dissertation or thesis 16 17 Unpublished dissertation or thesis
16 17 Dissertation abstract
16 17 Government publications
16 17
Unpublished raw data, untitled
16 17 Booklet, pamphlet or leaflet
16 17 Study guide
16 17
Conference proceedings, no author or title
16 17 Conference proceedings, with title
18 19 Conference proceedings,
with author 18 19 Unpublished paper presented at a meeting
18 19 Publication of limited circulation
18 19 Review
18 19
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