Husar, Sandra L. (6 January 1978). "Trichechus senegalensis"(PDF). Mammalian Species. 2011.2 (89). The American Society of Mammalogists: 1–3. doi:10.2307/3503790. JSTOR3503790. Archived(PDF) from the original on 21 May 2014. Retrieved November 13, 2011.
Husar, Sandra L. (6 January 1978). "Trichechus senegalensis"(PDF). Mammalian Species. 2011.2 (89). The American Society of Mammalogists: 1–3. doi:10.2307/3503790. JSTOR3503790. Archived(PDF) from the original on 21 May 2014. Retrieved November 13, 2011.
Husar, Sandra L. (6 January 1978). "Trichechus senegalensis"(PDF). Mammalian Species. 2011.2 (89). The American Society of Mammalogists: 1–3. doi:10.2307/3503790. JSTOR3503790. Archived(PDF) from the original on 21 May 2014. Retrieved November 13, 2011.
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"Manatee". Sea World. December 30, 2011. Archived from the original on January 18, 2012. Retrieved December 30, 2011.
Husar, Sandra L. (6 January 1978). "Trichechus senegalensis"(PDF). Mammalian Species. 2011.2 (89). The American Society of Mammalogists: 1–3. doi:10.2307/3503790. JSTOR3503790. Archived(PDF) from the original on 21 May 2014. Retrieved November 13, 2011.