APA
E. De Clercq, . (1991). Antiviral Research. Amsterdam: Elsevier Science Publishers B. V.
Chicago
E. De Clercq, . 1991. Antiviral Research. Amsterdam: Elsevier Science Publishers B. V.
Harvard
E. De Clercq, . (1991). Antiviral Research. Amsterdam: Elsevier Science Publishers B. V.
MLA
E. De Clercq, . Antiviral Research. Amsterdam: Elsevier Science Publishers B. V. 1991.