MLA

Digges, Leonard, d. 1571?. Tectonicon : briefly shewing the exact measuring and speedy reckoning all manner of land, squares ... &c. : furthermore declaring the perfect making and large use of the carpenters ruler .... 1656.. https://collections.library.yale.edu/catalog/2067001.

APA, 6th edition

Digges, Leonard, d. 1571?. (1656.)[Tectonicon : briefly shewing the exact measuring and speedy reckoning all manner of land, squares ... &c. : furthermore declaring the perfect making and large use of the carpenters ruler ...]. https://collections.library.yale.edu/catalog/2067001.