(197). Environmental pollution and conservation [kasetvideo]. Chepstow, Gwent : Audio-Visual Productions.
芝加哥风格引文Environmental Pollution and Conservation [kasetvideo]. Chepstow, Gwent : Audio-Visual Productions, 197.
MLA引文Environmental Pollution and Conservation [kasetvideo]. Chepstow, Gwent : Audio-Visual Productions, 197.
警告：这些引文格式不一定是100％准确.