Update README.txt

jespb · Nov 15, 2019 · 11dced7 · 11dced7
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diff --git a/README.txt b/README.txt
@@ -60,3 +60,6 @@ $ python Main_STGP.py
 	[-ts tournament_size]
 		- This flag expects an integer with the tournament size;
 		- By default, this value is set to 10.
+
+Reference:
+    Poli, R., Langdon, W.B., McPhee, N.F.: A Field Guide to Genetic Programming. Lulu Enterprises, UK Ltd (2008)