APA

Case J. E., Ryland S. L., Simkin T. & Howard K. A. (1973). Gravitational evidence for low-density mass beneath the Galápagos Islands. : .

Chicago

Case James E, Ryland S L, Simkin Tom and Howard Keith A. 1973. Gravitational evidence for low-density mass beneath the Galápagos Islands. : .

Harvard

Case J. E., Ryland S. L., Simkin T. and Howard K. A. (1973). Gravitational evidence for low-density mass beneath the Galápagos Islands. : .

MLA

Case James E, Ryland S L, Simkin Tom and Howard Keith A. Gravitational evidence for low-density mass beneath the Galápagos Islands. : . 1973.