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Thanks Stefan!

I have tried adding the line \usepackage{Harvard} on the thesis.tex file and I keep having the same problem. What file is Harvard and where should I have it located?

I am trying to add citations and bibliography to a latex file with multiple chapters and I get the following error.
Chapter 3.
) [13] [14] (./thesis.bbl
! Undefined control sequence.
<write> \string \harvardcite \codeof
\next
l.7

?
I understand there's a problem in the .bbl file but when I ...