Bishop, Sylvia; Hoeffler, Anke (2016). "Free and fair elections: A new database". Journal of Peace Research. 53 (4): 608–616. doi:10.1177/0022343316642508. S2CID110571606.
Bishop, Sylvia; Hoeffler, Anke (2016). "Free and fair elections: A new database". Journal of Peace Research. 53 (4): 608–616. doi:10.1177/0022343316642508. S2CID110571606.