APA

Kramer P., . (1973). Wildlife conservation in the Galápagos Islands (Ecuador). : .

Chicago

Kramer Peter, . 1973. Wildlife conservation in the Galápagos Islands (Ecuador). : .

Harvard

Kramer P., . (1973). Wildlife conservation in the Galápagos Islands (Ecuador). : .

MLA

Kramer Peter, . Wildlife conservation in the Galápagos Islands (Ecuador). : . 1973.