Tohutoro APA (7th ed.)
Ralf Steudel. Elemental Sulfur and Sulfur-Rich Compounds I. Springer.
Tohutoru Kātū Chicago (17th ed.)
Ralf Steudel. Elemental Sulfur and Sulfur-Rich Compounds I. Berlín, Alemania: Springer.
Tohutoro MLA (9th ed.)
Ralf Steudel. Elemental Sulfur and Sulfur-Rich Compounds I. Springer.
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