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  1. By: Graber, Richard R. (Richard Rex), - Hassler, Sylvia Sue
    Type: Article
    In: The Wilson bulletin
    Volume: 74
    Issue: 4
    Date: 1962
    Page Range: 367--380
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Hassler, Sylvia Sue - Graber, Richard R. (Richard Rex), - Bellrose, Frank C. (Frank Chapman),
    Type: Article
    In: The Wilson bulletin
    Volume: 75
    Issue: 1
    Date: 1963
    Page Range: 56--77
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-