Gray, J. H. (1970). Biological science: Organisms and population, a laboratory guide. Penguin Books.
芝加哥风格引文Gray, John H. Biological Science: Organisms and Population, a Laboratory Guide. Harmondsworth, England, United Kingdom: Penguin Books, 1970.
MLA引文Gray, John H. Biological Science: Organisms and Population, a Laboratory Guide. Penguin Books, 1970.
警告：这些引文格式不一定是100％准确.