Earth Science Curriculum Project. (1967). Investigating the earth: Teacher's guide; part one. Houghton Mifflin.
Citace podle Chicago (17th ed.)Earth Science Curriculum Project. Investigating the Earth: Teacher's Guide; Part One. Boston: Houghton Mifflin, 1967.
Citace podle MLA (9th ed.)Earth Science Curriculum Project. Investigating the Earth: Teacher's Guide; Part One. Houghton Mifflin, 1967.
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