APA引文

Environmental Education Project (Portland, Or.). (1978). Clearing. Environmental Education Project.

芝加哥风格引文

Environmental Education Project (Portland, Or.). Clearing. Portland, Or.: Environmental Education Project, 1978.

MLA引文

Environmental Education Project (Portland, Or.). Clearing. Environmental Education Project, 1978.

警告：这些引文格式不一定是100％准确.