"Acknowledgement vs. Acknowledgment – Correct Spelling – Grammarist". 22 September 2012. http://grammarist.com/spelling/acknowledgment-acknowledgement/
Councill, Isaac G.; Giles, C. Lee; Han, Hui; Manavoglu, Eren (2005). "Automatic acknowledgement indexing: expanding the semantics of contribution in the CiteSeer digital library". Proceedings of the 3rd international conference on Knowledge capture. K-CAP '05. pp. 19–26. CiteSeerX 10.1.1.59.1661. doi:10.1145/1088622.1088627. ISBN 1-59593-163-5. 1-59593-163-5
Giles, C. L.; Councill, I. G. (December 15, 2004). "Who gets acknowledged: Measuring scientific contributions through automatic acknowledgment indexing" (PDF). Proc. Natl. Acad. Sci. U.S.A. 101 (51): 17599–17604. Bibcode:2004PNAS..10117599G. doi:10.1073/pnas.0407743101. PMC 539757. PMID 15601767. /wiki/Lee_Giles
"About CiteSeerX". Archived from the original on 2013-09-01. Retrieved 2013-08-26. https://web.archive.org/web/20130901131452/http://csxstatic.ist.psu.edu/about
"About AckSeer". Archived from the original on 2013-05-01. https://web.archive.org/web/20130501190612/http://ackseer.ist.psu.edu/about