Some of these references require access to electronic journals, usually through a University library. Or you could do it the old-fashioned way, which is to walk into a university library or public library in a major city and read the article in the print journals section.
Chaney, Carole Kennedy, R. Michael Alvarez, and Jonathan Nagler. 1998. “Explaining the Gender Gap in US Presidential Elections, 1980-1992.” Political Research Quarterly, Vol 51, (June), 311-340.
Crowder-Meyer, Melody, “Gender Differences in Policy Preferences and Priorities,” Paper Presented to the Convention of the Midwest Political Science Association, April 2007.
Eichenberg, Richard, “Gender Differences in Attitudes Toward the Use of Force by the United States, 1990-2003” International Security, 28/1 (Summer 2003), 110-141.
Iversen, Torben and Frances Rosenbluth ,”The Political Economy of Gender: Explaining Cross-National Variation in the Gender Division of Labor and the Gender Voting Gap,” American Journal of Political Science, Vol. 50, No. 1, January 2006, Pp. 1–19.
Kaufman, Karen M., and John R. Petrocik. 1999. “The Changing Politics of American Men: Understanding the Sources of the Gender Gap.” American Journal of Political Science. Vol. 43. No. 3 (July). 864-887.
Shapiro, Robert and Harpreet Mahajan. 1986. “Gender Differences in Policy Preferences: A Summary of Trends from the 1960s to the 1980s.” Public Opinion Quarterly. Vol. 50. No. 1 (Spring). 42-61.
Silver, Nate, “‘Gender Gap’ Near Historic Highs,” New York Times, October 21, 2012.
Wolbrecht, Christina, “Parties and the Gender Gap,” in: Mischiefs of Faction, October 25, 2012.