Marbling at the Heyeck Press / Robin Heyeck.
MLA
Heyeck, Robin. Marbling at the Heyeck Press / Robin Heyeck. Heyeck Press, 1986. https://collections.library.yale.edu/catalog/16598886.
APA, 6th edition
Heyeck, R. (1986). Marbling at the Heyeck Press / Robin Heyeck. [Marbled papers (Paper)]. Heyeck Press, https://collections.library.yale.edu/catalog/16598886.