References
- 1920 . Proc. U.S. Nat. Mus. , lviii : 221 – 221 .
- As may be gathered from Mr. Pocock's remarks P. Z. S. 1924 1027 1027 the sexing of sloths is a difficult matter, so that collectors' records must be taken cum grano salis.
- 1892 . P. Z. S. , : 314 – 314 .
- 1917 . Ann. & Mag. Nat. Hist. , xix ( 8 ) : 352 – 352 .
- 1911 . P. Z. S. , : 132 – 132 .