diff --git a/_episodes/02-project-planning.md b/_episodes/02-project-planning.md
index e4a735f9..0dd5ec09 100644
--- a/_episodes/02-project-planning.md
+++ b/_episodes/02-project-planning.md
@@ -138,5 +138,4 @@ and asking for help are all valid ways of solving your problems. As you complete
 >
 >L. Welch, F. Lewitter, R. Schwartz, C. Brooksbank, P. Radivojac, B. Gaeta and M. Schneider, '[Bioinformatics Curriculum Guidelines: Toward a Definition of Core Competencies](http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3945096/)', PLoS Comput Biol, vol. 10, no. 3, p. e1003496, 2014.
 >
-> {: .source}
 {: .callout}