Helen Dwight Reid Educational Foundation. (1971). Journal of Environmental Education. Heldref Publications.
Chicago (17e ed.) BronvermeldingHelen Dwight Reid Educational Foundation. Journal of Environmental Education. Washington: Heldref Publications, 1971.
MLA (8e ed.) BronvermeldingHelen Dwight Reid Educational Foundation. Journal of Environmental Education. Heldref Publications, 1971.
Let op: Deze citaties zijn niet altijd 100% accuraat.