ALS to Samuel Hartlib (d. 1670?); n.p.
MLA
ALS to Samuel Hartlib (d. 1670?); N.p. 1652. https://collections.library.yale.edu/catalog/16839681.
APA, 6th edition
ALS to Samuel Hartlib (d. 1670?); n.p. (1652). [Manuscripts]. https://collections.library.yale.edu/catalog/16839681.