MLA

A Descriptive Sketch of the Island of St. Helena : Including Its Extent, Climate, Productions, Population, Government, Means of Defence, &c. &c. Printed for J. and E. Wallis, 42, Skinner-Street, Snow-Hill; and J. Wallis, Jun., Marine Library, Sidmouth, 0AD. https://collections.library.yale.edu/catalog/33332027.

APA, 6th edition

A descriptive sketch of the island of St. Helena : including its extent, climate, productions, population, government, means of defence, &c. &c. (0 C.E.). [Pictorial works, Views, Engravings, Broadsides]. Printed for J. and E. Wallis, 42, Skinner-Street, Snow-Hill; and J. Wallis, Jun., Marine Library, Sidmouth. https://collections.library.yale.edu/catalog/33332027.