1. Diagram Center. 2015. Image Description Guidelines. (2015). http://diagramcenter.org/table-of-contents-2.html Diagram Center. 2015. Image Description Guidelines. (2015). http://diagramcenter.org/table-of-contents-2.html
2. Steve Faulkner Arron Eicholz Travis Leithead Alex Danilo and Sangwhan Moon. 2017. HTML 5.2. (Dec. 2017). https://www.w3.org/TR/html52/ Steve Faulkner Arron Eicholz Travis Leithead Alex Danilo and Sangwhan Moon. 2017. HTML 5.2. (Dec. 2017). https://www.w3.org/TR/html52/