MLA

Harding, M. Esther (Mary Esther), 1888-1971, Jung, C. G. (Carl Gustav), 1875-1961. Cornwall seminar, July 1923, C.G. Jung : unauthorized notes / by M. Esther Harding.. 1923?]. https://collections.library.yale.edu/catalog/10076043.

APA, 6th edition

Harding, M. Esther (Mary Esther), 1888-1971, & Jung, C. G. (Carl Gustav), 1875-1961. (1923?])[Cornwall seminar, July 1923, C.G. Jung : unauthorized notes / by M. Esther Harding.]. https://collections.library.yale.edu/catalog/10076043.