THE GREAT LAKES' TROUBLED WATERS.

MLA

Cobb Jr., Charles E., et al. “The Great Lakes’ Troubled Waters.” National Geographic, vol. 172, no. 1, July 1987, p. 2. EBSCOhost, widgets.ebscohost.com/prod/customlink/proxify/proxify.php?count=1&encode=0&proxy=&find_1=&replace_1=&target=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=asx&AN=10072846&authtype=sso&custid=ns315887.

APA

Cobb Jr., C. E., Sacha, B., & Olsenius, R. (1987). The Great Lakes’ Troubled Waters. National Geographic, 172(1), 2.

Chicago

Cobb Jr., Charles E., Bob Sacha, and Richard Olsenius. 1987. “The Great Lakes’ Troubled Waters.” National Geographic 172 (1): 2. http://widgets.ebscohost.com/prod/customlink/proxify/proxify.php?count=1&encode=0&proxy=&find_1=&replace_1=&target=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=asx&AN=10072846&authtype=sso&custid=ns315887.