diff --git a/ReferenceMaterial/Parnas1978.pdf b/ReferenceMaterial/Parnas1978.pdf
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index c7b5a109819491ab3873ee7a0635c9c11ad6a3e6..c6da7ba81eb3ce8f4e77efbe0f891ae41ce866f7 100644
--- a/ReferenceMaterial/References.bib
+++ b/ReferenceMaterial/References.bib
@@ -1,13 +1,28 @@
 %% This BibTeX bibliography file was created using BibDesk.
 %% http://bibdesk.sourceforge.net/
 
-%% Created for Spencer Smith at 2019-09-23 12:34:27 -0400 
+
+%% Created for Spencer Smith at 2019-11-14 08:48:39 -0500 
 
 
 %% Saved with string encoding Unicode (UTF-8) 
 
 
 
+@inproceedings{Parnas1978,
+	Address = {Piscataway, NJ, USA},
+	Author = {David L. Parnas},
+	Booktitle = {ICSE '78: Proceedings of the 3rd international conference on Software engineering},
+	Date-Added = {2019-11-14 08:48:16 -0500},
+	Date-Modified = {2019-11-14 08:48:16 -0500},
+	Isbn = {none},
+	Location = {Atlanta, Georgia, United States},
+	Pages = {264--277},
+	Publisher = {IEEE Press},
+	Title = {Designing Software for Ease of Extension and Contraction},
+	Year = {1978},
+	Bdsk-File-1 = {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}}
+
 @book{Anton1987,
 	Author = {Anton, Howard},
 	Date-Added = {2019-09-23 12:34:25 -0400},
@@ -1407,7 +1422,7 @@ Best practices in software engineering specifically aim to increase software rob
 	Pages = {1-40},
 	Title = {Recommended Practice for Software Requirements Specifications},
 	Year = {1998},
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 	Bdsk-Url-1 = {http://dx.doi.org/10.1109/IEEESTD.1998.88286}}
 
 @inproceedings{SmithAndLai2005,