APA

Pfiffner S. M., Onstott T. C., Ruskeeniemi T., Talikka M., Bakermans C., McGown D., Chan E., Johnson A., Phelps T. J., Le Puil M., Difurio S. A., Pratt L. M., Stotler R., Frape S., Telling J., Lollar B. S., Neill I. & Zerbin B. (20090123). Challenges for coring deep permafrost on Earth and Mars. : Astrobiology.

Chicago

Pfiffner S M, Onstott T C, Ruskeeniemi T, Talikka M, Bakermans C, McGown D, Chan E, Johnson A, Phelps T J, Le Puil M, Difurio S A, Pratt L M, Stotler R, Frape S, Telling J, Lollar B Sherwood, Neill I and Zerbin B. 20090123. Challenges for coring deep permafrost on Earth and Mars. : Astrobiology.

Harvard

Pfiffner S. M., Onstott T. C., Ruskeeniemi T., Talikka M., Bakermans C., McGown D., Chan E., Johnson A., Phelps T. J., Le Puil M., Difurio S. A., Pratt L. M., Stotler R., Frape S., Telling J., Lollar B. S., Neill I. and Zerbin B. (20090123). Challenges for coring deep permafrost on Earth and Mars. : Astrobiology.

MLA

Pfiffner S M, Onstott T C, Ruskeeniemi T, Talikka M, Bakermans C, McGown D, Chan E, Johnson A, Phelps T J, Le Puil M, Difurio S A, Pratt L M, Stotler R, Frape S, Telling J, Lollar B Sherwood, Neill I and Zerbin B. Challenges for coring deep permafrost on Earth and Mars. : Astrobiology. 20090123.