Ex Libris, Ph. Mr. M. Helcelet
MLA
Ex Libris, Ph. Mr. M. Helcelet. 0AD. https://collections.library.yale.edu/catalog/16789516.
APA, 6th edition
Ex Libris, Ph. Mr. M. Helcelet. (0 C.E.). [Bookplates]. https://collections.library.yale.edu/catalog/16789516.