APA (7th ed.) Citation

British Library, Birkenhead, J., & Heylyn, P. (1643). Mercurius Aulicus (1643: London). [publisher not identified].

Chicago Style (17th ed.) Citation

British Library, John Birkenhead, and Peter Heylyn. Mercurius Aulicus (1643: London). [London]: [publisher not identified], 1643.

MLA (9th ed.) Citation

British Library, et al. Mercurius Aulicus (1643: London). [publisher not identified], 1643.