APA

Schramm B. G., Lance V. A. & Casares M. (1999). Reproductive cycles of male and female giant tortoises (Geochelone nigra) on the Galápagos Islands by plasma steriod analysis and ultrasound scanning. : .

Chicago

Schramm Beatrix G, Lance Valentine A and Casares Miguel. 1999. Reproductive cycles of male and female giant tortoises (Geochelone nigra) on the Galápagos Islands by plasma steriod analysis and ultrasound scanning. : .

Harvard

Schramm B. G., Lance V. A. and Casares M. (1999). Reproductive cycles of male and female giant tortoises (Geochelone nigra) on the Galápagos Islands by plasma steriod analysis and ultrasound scanning. : .

MLA

Schramm Beatrix G, Lance Valentine A and Casares Miguel. Reproductive cycles of male and female giant tortoises (Geochelone nigra) on the Galápagos Islands by plasma steriod analysis and ultrasound scanning. : . 1999.