1.
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Chicago, Ill. : Encyclopudia Britannica, c1991. Fifteenth edition.
Portuguese | A 3(111) ENC(15) 1991 |
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2.
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Chicago : Encyclopaedia Britannica, Inc., c1978. Fifteenth edition.
English | A 3(111) ENC |
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3.
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Osnabrück : Felix Dietrich Verlag, 1993. 5. erw. Aufl.
German | A 3 LEI.I(5) |
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4.
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Rahway, Nj : Merck, 1989. Eleventh edition.
English | A 3(111) MER |
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5.
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Geneva [Switzerland] : World Intellectual Property Organization, 1977.
English | E 3513 OMPI.B/EC |
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6.
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Whitehouse Station, NJ : Merck Research Laboratories, 2001. Thirteenth edition.
English | A 3 MER(13) |
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