1. Batchelder, J. S. (2012). Additive manufacturing system and method with interchangeable cartridges for printing customized chocolate confections. US Patent 13,432,431.
2. Ben-Yoseph, E., Collins, T. M., Shastry, A. V., Suttle, J. M., Walters, M., & Willcocks, N. A. (2009). US Patent 7,597,752.
3. Bocusini. http://www.bocusini.com/ . Accessed December 2015.
4. Burritobot (2014). A 3-D printer that spits out burritos. http://www.fastcodesign.com/1670070/burritobot-a-3-d-printer-that-spits-out-burritos . Accessed December 2015.
5. Castle, L., Mayo, A., & Gilbert, J. (1989). Migration of plasticizers from printing inks into foods. Food Additives & Contaminants, 6(4), 437–443.