Cita APA (7th ed.)

Grosvenor, G., & Showalter, W. J. Flags of the world.

Cita Chicago (17th ed.)

Grosvenor, Gilbert, i William J. Showalter. Flags of the World. n.p.

Cita MLA (8th ed.)

Grosvenor, Gilbert, i William J. Showalter. Flags of the World.