MLA

Welling, Georg von, 1655-1727. Philosophy of the universe, or a general system of chemical, metaphysical, and mathematical knowledge, translated into English from Opus mago-cabbalisticum et theosophicum, Part I, by Francis Barrett. 1801 June. https://collections.library.yale.edu/catalog/2066950.

APA, 6th edition

Welling, Georg von, 1655-1727. (1801 June)[Philosophy of the universe, or a general system of chemical, metaphysical, and mathematical knowledge, translated into English from Opus mago-cabbalisticum et theosophicum, Part I, by Francis Barrett]. https://collections.library.yale.edu/catalog/2066950.