A fifty–fifty chance.

MLA

Pollack, Henry N. “A Fifty–fifty Chance.” Uncertain Science ... Uncertain World, Jan. 2003, pp. 87–104. EBSCOhost, https://doi.org/10.1017/CBO9780511541377.007.

APA

Pollack, H. N. (2003). A fifty–fifty chance. Uncertain Science ... Uncertain World, 87–104. https://doi.org/10.1017/CBO9780511541377.007

Chicago

Pollack, Henry N. 2003. “A Fifty–fifty Chance.” Uncertain Science ... Uncertain World, January, 87–104. doi:10.1017/CBO9780511541377.007.