Cita APA (7a ed.)
Pulver, D. Introduction to the stamps of Mexico.
Cita Chicago Style (17a ed.)
Pulver, Dale. Introduction to the Stamps of Mexico.
Cita MLA (9a ed.)
Pulver, Dale. Introduction to the Stamps of Mexico.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.