Stidworthy, J. (1997). Macmillan Revised ENCYCLOPEDIA of SCIENCE Plants and Animal 5. Macmillan Reference.
Lua i Stíl Chicago (17ú heag.)Stidworthy, John. Macmillan Revised ENCYCLOPEDIA of SCIENCE Plants and Animal 5. Macmillan Reference, 1997.
Lua MLA (8ú heag.)Stidworthy, John. Macmillan Revised ENCYCLOPEDIA of SCIENCE Plants and Animal 5. Macmillan Reference, 1997.
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