Spot the difference.

MLA

Donaldson, Peter, et al. “Spot the Difference.” Defence Helicopter: Serving the Military & Parapublic Communities, vol. 30, no. 5, Sept. 2011, p. 21. 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=edo&AN=67744217&authtype=sso&custid=ns315887.

APA

Donaldson, P., Gourley, S. R., Osborne, T., & Skinner, T. (2011). Spot the difference. Defence Helicopter: Serving the Military & Parapublic Communities, 30(5), 21.

Chicago

Donaldson, Peter, Scott R. Gourley, Tony Osborne, and Tony Skinner. 2011. “Spot the Difference.” Defence Helicopter: Serving the Military & Parapublic Communities 30 (5): 21. 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=edo&AN=67744217&authtype=sso&custid=ns315887.