ebrary, Inc, Ennals, J. R., & Salomon, R. H. (2011). Older workers in a sustainable society. Peter Lang.
芝加哥风格引文ebrary, Inc, J. R. Ennals, 与 Robert H. Salomon. Older Workers in a Sustainable Society. Frankfurt am Main ; New York: Peter Lang, 2011.
MLA引文ebrary, Inc, et al. Older Workers in a Sustainable Society. Peter Lang, 2011.
警告：这些引文格式不一定是100％准确.