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1. SSL demystified. (URL)
2. Generating X.509 Certificates. (URL)
3. Spanish e-commerce white book. (URL)
4. Rules for VISA merchants. (URL)
5. Handbook of applied cryptography (URL)
6. Introduction to Secure Electronic Transaction (SET), by William Stallings (URL)
7. Chen, J. Q., Schmidt, M. B., Phan, D. D., and Arnett, K. P. 2008. E-commerce security threats: awareness, trust and practice. Int. J. Inf. Syst. Chang. Manage. 3, 1 (Jul. 2008), 16-32. (URL)