Update DeveloperGuide.md

AY2324S2-CS2103T-W11-2 · Apr 15, 2024 · 598131d · 598131d
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@@ -17,6 +17,8 @@ _{ list here sources of all reused/adapted ideas, code, documentation, and third
 
 1. CS2103T AB3 Source Code
 2. https://uibakery.io/regex-library/phone-number-java - Regarding Phone Validation Java Regex
+3. Java documentation for BigDecimal https://docs.oracle.com/javase/8/docs/api/java/math/BigDecimal.html.
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 ## **Setting up, getting started**