Johnson, G. (1872). The Elimination of Poisons.
Chicago Style aipamenaJohnson, George. The Elimination of Poisons. 1872.
MLA aipamenaJohnson, George. The Elimination of Poisons. 1872.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
Johnson, G. (1872). The Elimination of Poisons.
Chicago Style aipamenaJohnson, George. The Elimination of Poisons. 1872.
MLA aipamenaJohnson, George. The Elimination of Poisons. 1872.