Não informado. (1969). Memoirs of the Hourglass Cruises. Florida Department of Natural Resources, Marine Research Laboratory.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Memoirs of the Hourglass Cruises. St. Petersburg, Fla: Florida Department of Natural Resources, Marine Research Laboratory, 1969.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Memoirs of the Hourglass Cruises. Florida Department of Natural Resources, Marine Research Laboratory, 1969.
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