APA (7th ed.) Citation

Heylyn, P., & Wright, P. (1972). A help to English history ... [AMS Press].

Chicago Style (17th ed.) Citation

Heylyn, Peter, and Paul Wright. A Help to English History ... [New York]: [AMS Press], 1972.

MLA (9th ed.) Citation

Heylyn, Peter, and Paul Wright. A Help to English History ... [AMS Press], 1972.