Carballo, L. R. (2000). Keeping in touch: A workbook in human relations development. s.n.
芝加哥风格引文Carballo, Leni Ramos. Keeping in Touch: A Workbook in Human Relations Development. [S.l: s.n, 2000.
MLA引文Carballo, Leni Ramos. Keeping in Touch: A Workbook in Human Relations Development. s.n, 2000.
警告：这些引文格式不一定是100％准确.