Cita APA (7th ed.)

Porcelli, D., Stone, J., & O'Nions, R. (1987). Enhanced 3He 4He ratios and cosmogenic helium in ultramafic xenoliths.

Cita Chicago (17th ed.)

Porcelli, DR, J. Stone, i R. O'Nions. Enhanced 3He 4He Ratios and Cosmogenic Helium in Ultramafic Xenoliths. 1987.

Cita MLA (9th ed.)

Porcelli, DR, et al. Enhanced 3He 4He Ratios and Cosmogenic Helium in Ultramafic Xenoliths. 1987.