Cite
Pale-legged Leaf Warbler: new to Britain.
MLA
Headon, John, et al. “Pale-Legged Leaf Warbler: New to Britain.” British Birds, vol. 111, no. 8, Aug. 2018, pp. 438–45. 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=131149638&authtype=sso&custid=ns315887.
APA
Headon, J., Collinson, J. M., & Cade, M. (2018). Pale-legged Leaf Warbler: new to Britain. British Birds, 111(8), 438–445.
Chicago
Headon, John, J. Martin Collinson, and Martin Cade. 2018. “Pale-Legged Leaf Warbler: New to Britain.” British Birds 111 (8): 438–45. 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=131149638&authtype=sso&custid=ns315887.