The Nesting Habits of Wagler's Oropendola (Zarhynchus wagleri) on Barro Colorado Islandv. 58No. 3123–166
Chapman, Frank Michler. 1928. "The Nesting Habits of Wagler's Oropendola (Zarhynchus wagleri) on Barro Colorado Island." Bulletin of the American Museum of Natural History, 58, (3) 123–166.