Cita APA (7a ed.)

Taylor, B. G. (1891). The sardonyx seal: A romance of Normandy. G.P. Putnam's Sons.

Cita Chicago Style (17a ed.)

Taylor, Belle Gray. The Sardonyx Seal: A Romance of Normandy. New York: G.P. Putnam's Sons, 1891.

Cita MLA (8a ed.)

Taylor, Belle Gray. The Sardonyx Seal: A Romance of Normandy. G.P. Putnam's Sons, 1891.