Hurd, P. D. (1969). New Directions in teaching secondary school science. Rand McNally.
Chicago Style (17th ed.) CitationHurd, Paul Dehart. New Directions in Teaching Secondary School Science. Chicago: Rand McNally, 1969.
MLA (9th ed.) CitationHurd, Paul Dehart. New Directions in Teaching Secondary School Science. Rand McNally, 1969.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.