Chamberlain, J. M. (1965). Planetas, estrellas y espacio = planets, stars and space. Creative Educational Society, Inc.
Cita Chicago Style (17a ed.)Chamberlain, Joseph Miles. Planetas, Estrellas Y Espacio = Planets, Stars and Space. Minnesota: Creative Educational Society, Inc, 1965.
Cita MLA (9a ed.)Chamberlain, Joseph Miles. Planetas, Estrellas Y Espacio = Planets, Stars and Space. Creative Educational Society, Inc, 1965.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.