APA

Keirans J. E., Hoogstraal H. & Clifford C. M. (1973). The Amblyomma (Acarina: Ixodidae) parasitic on giant tortoises (Reptilia: Testudinidae) of the Galápagos Islands. : .

Chicago

Keirans James E, Hoogstraal Harry and Clifford Carleton M. 1973. The Amblyomma (Acarina: Ixodidae) parasitic on giant tortoises (Reptilia: Testudinidae) of the Galápagos Islands. : .

Harvard

Keirans J. E., Hoogstraal H. and Clifford C. M. (1973). The Amblyomma (Acarina: Ixodidae) parasitic on giant tortoises (Reptilia: Testudinidae) of the Galápagos Islands. : .

MLA

Keirans James E, Hoogstraal Harry and Clifford Carleton M. The Amblyomma (Acarina: Ixodidae) parasitic on giant tortoises (Reptilia: Testudinidae) of the Galápagos Islands. : . 1973.