Keany, M. (1981). Earth Science laboratory/activity book: Annotated teacher's edition. Prentice Hall.
Cita Chicago (17th ed.)Keany, Michael. Earth Science Laboratory/activity Book: Annotated Teacher's Edition. Prentice Hall, 1981.
Cita MLA (9th ed.)Keany, Michael. Earth Science Laboratory/activity Book: Annotated Teacher's Edition. Prentice Hall, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.