Ward, P., & Kennedy, W. (1993). Maastrichtian ammonites from the Biscay region (France, Spain).
芝加哥风格引文Ward, P., 与 W. Kennedy. Maastrichtian Ammonites from the Biscay Region (France, Spain). 1993.
MLA引文Ward, P., 与 W. Kennedy. Maastrichtian Ammonites from the Biscay Region (France, Spain). 1993.
警告：这些引文格式不一定是100％准确.