Grove 2007, ப. 81 Grove, Richard H. (2007), "The Great El Nino of 1789–93 and its Global Consequences: Reconstructing an Extreme Climate Event in World Environmental History", The Medieval History Journal, 10 (1&2): 75–98, எண்ணிம ஆவணச் சுட்டி:10.1177/097194580701000203
Grove 2007, ப. 80 Grove, Richard H. (2007), "The Great El Nino of 1789–93 and its Global Consequences: Reconstructing an Extreme Climate Event in World Environmental History", The Medieval History Journal, 10 (1&2): 75–98, எண்ணிம ஆவணச் சுட்டி:10.1177/097194580701000203
Grove 2007, ப. 82 Grove, Richard H. (2007), "The Great El Nino of 1789–93 and its Global Consequences: Reconstructing an Extreme Climate Event in World Environmental History", The Medieval History Journal, 10 (1&2): 75–98, எண்ணிம ஆவணச் சுட்டி:10.1177/097194580701000203
Grove 2007, ப. 83 Grove, Richard H. (2007), "The Great El Nino of 1789–93 and its Global Consequences: Reconstructing an Extreme Climate Event in World Environmental History", The Medieval History Journal, 10 (1&2): 75–98, எண்ணிம ஆவணச் சுட்டி:10.1177/097194580701000203