Voices of America (Radio Program) & Cohen, S. B. (1967). Geography and the American environment. s.n.
芝加哥风格引文Voices of America (Radio Program) 与 Saul B. Cohen. Geography and the American Environment. Washington, D.C: s.n, 1967.
MLA引文Voices of America (Radio Program) 与 Saul B. Cohen. Geography and the American Environment. s.n, 1967.
警告：这些引文格式不一定是100％准确.