Digital Commonwealth

MLA

Escher, M. C. (Maurits Cornelis). Ascending and descending. Mar 1960. Web. 20 Feb 2019. <https://ark.digitalcommonwealth.org/ark:/50959/3r076s51v>.

APA

Escher, M. (1960, March). Ascending and descending [Print]. Retrieved from https://ark.digitalcommonwealth.org/ark:/50959/3r076s51v

Chicago

Escher, M. C. (Maurits Cornelis). "Ascending and descending." Print. March 1960. Digital Commonwealth, https://ark.digitalcommonwealth.org/ark:/50959/3r076s51v (accessed February 20, 2019).