355179 Spellman, F. R. (1999). Confined space entry: A guide to compliance. Lancaster, Pa. : Technomic Pub. Co..
Cita Chicago (17th ed.)355179 Spellman, Frank R. Confined Space Entry: A Guide to Compliance. Lancaster, Pa. : Technomic Pub. Co., 1999.
Cita MLA (9th ed.)355179 Spellman, Frank R. Confined Space Entry: A Guide to Compliance. Lancaster, Pa. : Technomic Pub. Co., 1999.
Atenció: Aquestes cites poden no estar 100% correctes.