Stringer, R., & Cartledge, R. (2014). Twilio cookbook: Over 70 easy-to-follow recipes, from exploring the key features of Twilio to building advanced telephony apps (Second edition.). Packt Publishing.

Stringer, Roger, and Rick Cartledge. Twilio Cookbook: Over 70 Easy-to-follow Recipes, from Exploring the Key Features of Twilio to Building Advanced Telephony Apps. Second edition. Birmingham, England: Packt Publishing, 2014.

Stringer, Roger, and Rick Cartledge. Twilio Cookbook: Over 70 Easy-to-follow Recipes, from Exploring the Key Features of Twilio to Building Advanced Telephony Apps. Second edition. Packt Publishing, 2014.