1911. Ueber die Hohe des vogelzuges. Verh. V Int. Ornithol. Congr. 557-562.
McMillan, N. T.
1938. Birds and the wind. Bird Lore 40(6): 397-406. Reprinted Smithson. Rep. for 1939: 355-363.
Magee, M. J.
1938. Evening Grosbeak recoveries. Northeastern Bird-Banding Assoc. Bull. 4: 56-59.
Main, J. S.
1932. The influence of temperature on migration. Wilson Bull. 44: 10-12.
Manville, R. H.
1963. Altitude record for mallard. Wilson Bull. 75: 9
Marshall, A. J.