Edit README.md

assays/MiniPam/README.md

@@ -42,12 +42,12 @@ Agglomerative hierarchical clustering was applied on the scaled PhiPSII means fo
 ### Software and tools
 
 -  WinControl-3 Software (version 3.29-rev.1112) (Walz Heinz GmbH, Effeltrich, Germany)
-- R (with package 'cluster')
+- R (with package 'cluster') [1]
 
 ### Assay Date
 
 This assay was performed at the visible inflorescence stage of development (BBCH 59); 46-50 days after sowing
 
-Reference:
+#### Reference:
 
 [1] Maechler, M.; Rousseeuw, P.; Struyf, A.; Hubert, M.; Hornik, K.; Studer, M.; Roudier, P.; Gonzalez, J.; Kozlowski, K.; Schubert, E.; et al. “Finding Groups in Data”: Cluster Analysis Extended Rousseeuw et al. Available online: https://cran.r-project.org/web/packages/cluster/cluster.pdf (accessed on 26 February 2021).
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