Hat Island, Wisconsin (Fig. 55) in Flora and Vegetation of the Grand Traverse Islands (Lake Michigan), Wisconsin and Michigan by Emmet J. Judziewicz, The Michigan Botanist, Volume 40, Number 4, October 2001, page 120
Figure 15. Hat Island, in Colonial birds nesting on man-made and natural sites in the U.S. Great Lakes by William C. Scharf, Northwestern Michigan College, Traverse City, Michigan, published by Vicksburg, MS: Waterways Experiment Station, 1978