Kramer, H. J. (2002). Observation of the earth and its environment (4th ed.). Berlin: Springer.
Παραπομπή Chicago StyleKramer, Herbert J. Observation of the Earth and Its Environment. 4th ed. Berlin: Springer, 2002.
Παραπομπή MLAKramer, Herbert J. Observation of the Earth and Its Environment. 4th ed. Berlin: Springer, 2002.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.