Spence, I. (2003). Royal Horticultural Society garden plants and flowers. Dorling Kindersley.
芝加哥风格引文Spence, Ian. Royal Horticultural Society Garden Plants and Flowers. London: Dorling Kindersley, 2003.
MLA引文Spence, Ian. Royal Horticultural Society Garden Plants and Flowers. Dorling Kindersley, 2003.
警告：这些引文格式不一定是100％准确.