Earth Science Curriculum Project. (1965). Investigating the earth: Teacher's guide 2 (rev. 1965.). Johnson Publishing.
Citazione stile Chigago Style (17a edizione)Earth Science Curriculum Project. Investigating the Earth: Teacher's Guide 2. rev. 1965. Colorado, BO: Johnson Publishing, 1965.
Citatione MLA (9a ed.)Earth Science Curriculum Project. Investigating the Earth: Teacher's Guide 2. rev. 1965. Johnson Publishing, 1965.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.