ebrary, Inc, Nowak, K. I., & Strybel, H. F. (2012). Spruce: Ecology, management, and conservation. Nova Science Publishers.
芝加哥风格引文ebrary, Inc, Kajetan I. Nowak, 与 Helena F. Strybel. Spruce: Ecology, Management, and Conservation. New York: Nova Science Publishers, 2012.
MLA引文ebrary, Inc, et al. Spruce: Ecology, Management, and Conservation. Nova Science Publishers, 2012.
警告：这些引文格式不一定是100％准确.