»What are MD2, MD4, and MD5?«. Public-Key Cryptography Standards (PKCS): PKCS #7: Cryptographic Message Syntax Standard: 3.6 Other Cryptographic Techniques: 3.6.6 What are MD2, MD4, and MD5?. RSA Laboratories. Arhivirano iz prvotnega spletišča dne 1. septembra 2011. Pridobljeno 29. aprila 2011.
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»What are MD2, MD4, and MD5?«. Public-Key Cryptography Standards (PKCS): PKCS #7: Cryptographic Message Syntax Standard: 3.6 Other Cryptographic Techniques: 3.6.6 What are MD2, MD4, and MD5?. RSA Laboratories. Arhivirano iz prvotnega spletišča dne 1. septembra 2011. Pridobljeno 29. aprila 2011.