Não informado. (1998). Process Engineering Suppliers Guide. Technical Indexes.
Chicago (17e ed.) BronvermeldingNão informado. Process Engineering Suppliers Guide. Berkshire, Inglaterra: Technical Indexes, 1998.
MLA (8e ed.) BronvermeldingNão informado. Process Engineering Suppliers Guide. Technical Indexes, 1998.
Let op: Deze citaties zijn niet altijd 100% accuraat.