Pan American Union. (1933). Bibliographies on Pan American Topics: Suggested for high schools. Pan American Union.
Cita Chicago Style (17a ed.)Pan American Union. Bibliographies on Pan American Topics: Suggested for High Schools. Washington: Pan American Union, 1933.
Cita MLA (9a ed.)Pan American Union. Bibliographies on Pan American Topics: Suggested for High Schools. Pan American Union, 1933.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.