MLA

Perkins, Samuel, fl. 1625-1643. Perkins 1640. A new almanack and prognostication for the yeare of our Lord God, 1640. Being the bissextile, or leape-yeare, and from the worlds creation, 5602 .... 1640. https://collections.library.yale.edu/catalog/10990712.

APA, 6th edition

Perkins, Samuel, fl. 1625-1643. (1640)[Perkins 1640. A new almanack and prognostication for the yeare of our Lord God, 1640. Being the bissextile, or leape-yeare, and from the worlds creation, 5602 ...]. https://collections.library.yale.edu/catalog/10990712.