Switch to the alphabetic bibliography and citation style.

preamble.tex

@@ -537,7 +537,7 @@
 \usepackage{csquotes} % recommended for biblatex
 % list up to 99 names instead of the default 3 and set
 % giveninits=true to match the abbrv bibtex style.
-\usepackage[backend=biber,bibencoding=utf8,style=numeric,sortcites,maxnames=99,giveninits=true]{biblatex}
+\usepackage[backend=biber,bibencoding=utf8,style=alphabetic,sortcites,maxnames=99,giveninits=true]{biblatex}
 \addbibresource{cheri.bib}
 % Note: \citetitle formats the title differently depending on the type of entry,
 % whereas this macro always uses \textit{}