Rosén, E.; Tegman, R. (1988). Preparative and X-ray powder diffraction study of the polysulfides Na2S2, Na2S4 and Na2S5. Acta Chem. Scand.25: 3329–3336. DOI: 10.3891/acta.chem.scand.25-3329.
Dev, S.; Ramli, E.; Rauchfuss, T. B.; Wilson, S. R. (1991). Synthesis and Structure of [M(N-Methylimidazole)6]S8: Polysulfide Salts Prepared by the Reaction N-Methylimidazole + Metal Powder + Sulfur. Inorg. Chem.30 (11): 2514. DOI: 10.1021/ic00011a011.
Draganjac, M. E.; Rauchfuss, T. B. (1985). Transition Metal Polysulfides: Coordination Compounds with Purely Inorganic Chelate Ligands. Angew. Chem. Int. Ed. Engl.24 (9): 742. DOI: 10.1002/anie.198507421.
Takeda, N., Tokitoh, N., Okazaki, R. (2003). Polysulfido Complexes of Main Group and Transition Metals. DOI:10.1007/b13184, 153–202. ISBN 3-540-40378-7.