APA Style
National Geographic: At home with arctic wolf. (1987).
Washington, D.C.:
.
Chicago Style
National Geographic: At home with arctic wolf.
.
Washington, D.C.:
,
1987.
Text.
MLA Style
National Geographic: At home with arctic wolf.
.
Washington, D.C.:
,
1987.
Text.
Turabian Style
National Geographic: At home with arctic wolf.
Washington, D.C.:
,
1987.
Print.