Cita APA (7a ed.)
(1984). Focus on earth science (teachers annoted ed.). Charles E. M.
Cita Chicago Style (17a ed.)
Focus on Earth Science. teachers annoted ed. Ohio: Charles E. M, 1984.
Cita MLA (9a ed.)
Focus on Earth Science. teachers annoted ed. Charles E. M, 1984.
Precaución: Estas citas no son 100% exactas.