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請問百科全書、字典, 是屬於二次文獻? 還是三次文獻? 好像兩種說法都有?

有關「百科全書、字典是屬於二次文獻 還是三次文獻」之資料,答覆如下:

一、
(一)
secondary source
Any published or unpublished work that is one step removed from the original source, usually describing, summarizing, analyzing, evaluating, derived from, or based on primary source materials, for example, a review, critical analysis, second-person account, or biographical or historical study. Also refers to material other than primary sources used in the preparation of a written work. Compare with tertiary source.

(二)
tertiary source
A written work, such as a chapter in a textbook or entry in a reference book, based entirely on secondary sources, rather than on original research involving primary documents. Whether a source is secondary or tertiary can be determined by examining the bibliography (if one is provided). Another clue is that secondary sources are almost always written by experts, but tertiary sources may be written by staff writers who have an interest in the topic but are not scholars on the subject.

資料來源:
ODLIS: Online Dictionary for Library and Information Science
http://www.abc-clio.com/ODLIS/odlis_A.aspx

二、
各級來源資料比較列表

資料來源:
二次文獻 > 維基百科
http://zh.wikipedia.org/wiki/%E4%BA%8C%E6%AC%A1%E6%96%87%E7%8C%AE

三、
……一次文獻是指從研究開始到二年之間的原始文獻。一次文獻包括非正式出版之研究筆記、技術經驗等;正式出版之簡訊、專利、技術報告、博碩士論文等。一次文獻經過整理後才有再現、重現、抽煉,所以百科全書、指南、字典都是由一次文獻中抽煉出來的知識,以上述型式出版者,稱為二次文獻。為便於利用二次文獻,將其再加以整理,就形成所謂的三次文獻,如書目的書目及述評等。透過三次文獻之再利用,融入個人研發工作,創造出新知識,形成整個科學文獻的進化圖(賴鼎銘,民90)……

資料來源:
從知識管理淺談長榮大學圖書館資訊資源組織與整理 > 
國立成功大學圖書館館刊
http://www.lib.ncku.edu.tw/journal/12/10_2.htm
http://www.lib.ncku.edu.tw/journal/12/pdf/12-10.pdf

四、
臺北市立圖書館 > 線上參考服務 >
請問文獻可區分為那些類型?尤其是零次文獻、一次文獻、二次文獻、三次文獻的定義,有沒有可以參考的書或依據出處?
http://webref.tpml.edu.tw/sp.asp?xdurl=superXD/question_adult_01_d.asp&id=10156&mp=10