(1978). International Union of Pure and Applied Chemistry. Bulgarian Academy of Science.
Citazione stile Chigago Style (17a edizione)International Union of Pure and Applied Chemistry. Sofia: Bulgarian Academy of Science, 1978.
Citatione MLA (9a ed.)International Union of Pure and Applied Chemistry. Bulgarian Academy of Science, 1978.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.