(1989). International Standard ISO 2509 (1989-05-15).Sound-absorbing expanded pure agglomerated cork in tiles =: Agglomeres expanses purs de liege absorbants acoustiques en dalles (2nd ed.). Geneve: International Organization for Standardization.
Παραπομπή Chicago StyleInternational Standard ISO 2509 (1989-05-15).Sound-absorbing Expanded Pure Agglomerated Cork in Tiles =: Agglomeres Expanses Purs De Liege Absorbants Acoustiques En Dalles. 2nd ed. Geneve: International Organization for Standardization, 1989.
Παραπομπή MLAInternational Standard ISO 2509 (1989-05-15).Sound-absorbing Expanded Pure Agglomerated Cork in Tiles =: Agglomeres Expanses Purs De Liege Absorbants Acoustiques En Dalles. 2nd ed. Geneve: International Organization for Standardization, 1989.