Cita APA (7a ed.)

Petroski, H. (1990). The pencil: A history of design and circumstance ([1st ed., 4th printing].). Knopf.

Cita Chicago Style (17a ed.)

Petroski, Henry. The Pencil: A History of Design and Circumstance. [1st ed., 4th printing]. New York: Knopf, 1990.

Cita MLA (9a ed.)

Petroski, Henry. The Pencil: A History of Design and Circumstance. [1st ed., 4th printing]. Knopf, 1990.