MLA

Massacre of the French King! : View of La Guillotine, or the Modern Beheading Machine, at Paris, by Which the Unfortunate Louis XVI (Late King of France) Suffered on the Scaffold, January 21st, 1793. Printed at the Minerva Office, for William Lane, Leadenhall-Street, and sold wholesale at one guinea per hundred, And retail by every bookseller, stationer, &c. in England, Scotland and Ireland, 0AD. https://collections.library.yale.edu/catalog/33116211.

APA, 6th edition

Massacre of the French king! : view of la guillotine, or the modern beheading machine, at Paris, by which the unfortunate Louis XVI (late King of France) suffered on the scaffold, January 21st, 1793. (0 C.E.). [Broadsides, Decapitations France, Guillotines (Punishment)]. Printed at the Minerva Office, for William Lane, Leadenhall-Street, and sold wholesale at one guinea per hundred, And retail by every bookseller, stationer, &c. in England, Scotland and Ireland. https://collections.library.yale.edu/catalog/33116211.