APA

Robeck T. R., Rostal D. C., Burchfield P. M., Owens D. W. & Kraemer D. C. (1990). Ultrasound imaging of reproductive organs and eggs in Galapagos tortoises, Geochelone elephantopus spp. : .

Chicago

Robeck Todd R, Rostal David C, Burchfield Patrick M, Owens David W and Kraemer Duane C. 1990. Ultrasound imaging of reproductive organs and eggs in Galapagos tortoises, Geochelone elephantopus spp. : .

Harvard

Robeck T. R., Rostal D. C., Burchfield P. M., Owens D. W. and Kraemer D. C. (1990). Ultrasound imaging of reproductive organs and eggs in Galapagos tortoises, Geochelone elephantopus spp. : .

MLA

Robeck Todd R, Rostal David C, Burchfield Patrick M, Owens David W and Kraemer Duane C. Ultrasound imaging of reproductive organs and eggs in Galapagos tortoises, Geochelone elephantopus spp. : . 1990.