Survivalgids.

MLA

Sweeney, Michael S., et al. Survivalgids. [S.l.]: National Geographic, 2009.

APA

Sweeney, M. S., Kayal, M., Towner, E., & van den Meijdenberg, I. (2009). Survivalgids. [S.l.]: National Geographic.

Chicago

Sweeney, Michael S., Michele Kayal, Elizabeth Towner, and Ilse van den Meijdenberg. Survivalgids. [S.l.]: National Geographic, 2009.