MLA

Always Fasten Safety Belt [Graphic]. Directorate of Air Traffic and Safety, and Directorate of Safety Education, 0AD. https://collections.library.yale.edu/catalog/16049176.

APA, 6th edition

Always fasten safety belt [graphic]. (0 C.E.). [Posters, War posters]. Directorate of Air Traffic and Safety, and Directorate of Safety Education. https://collections.library.yale.edu/catalog/16049176.