Cvancara, A. M. (1995). A field manual for the amateur geologist: Tools and activities for exploring our planet (Rev. ed.). New York: Wiley.
Παραπομπή Chicago StyleCvancara, Alan M. A Field Manual for the Amateur Geologist: Tools and Activities for Exploring Our Planet. Rev. ed. New York: Wiley, 1995.
Παραπομπή MLACvancara, Alan M. A Field Manual for the Amateur Geologist: Tools and Activities for Exploring Our Planet. Rev. ed. New York: Wiley, 1995.
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