Broad, L. P., & Butterworth, N. T. (1976). The playgroup handbook. Souvenir Press.
芝加哥风格引文Broad, Laura Peabody, 与 Nancy Towner Butterworth. The Playgroup Handbook. London: Souvenir Press, 1976.
MLA引文Broad, Laura Peabody, 与 Nancy Towner Butterworth. The Playgroup Handbook. Souvenir Press, 1976.
警告：这些引文格式不一定是100％准确.