APA-referens

PIGDR. (1976). Potash: Fertilizers basic chemicals salt spar. Potash industry German democratic republic.

Chicago-stil citat

PIGDR. Potash: Fertilizers Basic Chemicals Salt Spar. Handel GDR: Potash industry German democratic republic, 1976.

MLA-referens

PIGDR. Potash: Fertilizers Basic Chemicals Salt Spar. Potash industry German democratic republic, 1976.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.