William E. Barklow

Some underwater sounds of the hippopotamus (hippopotamus amphibius)

William E. Barklow, 1997 .

Graded Frequency Variations of the Tremolo Call of the Common Loon (Gavia immer)

William E. Barklow, 1979 .

Amphibious communication with sound in hippos, Hippopotamus amphibius

William E. Barklow, 2004, Animal Behaviour.

Mitochondrial DNA Sequence Variation in Hippopotamus amphibius from Kruger National Park, Republic of South Africa

R. Beckwitt, J. Hettinger, C. Sánchez, 2016, African Zoology.

A PCR-based method for sex identification in Hippopotamus amphibius

R. Beckwitt, J. Shea, William E. Barklow, 2002 .