APA

Folkedahl B. C., Schobert H. H. & Schobert H. H.Effects of atmosphere on viscosity of selected bituminous and low-ranks coal ash slags. : .

Chicago

Folkedahl Bruce C, Schobert Harold H and Schobert Harold H.Effects of atmosphere on viscosity of selected bituminous and low-ranks coal ash slags. : .

Harvard

Folkedahl B. C., Schobert H. H. and Schobert H. H.Effects of atmosphere on viscosity of selected bituminous and low-ranks coal ash slags. : .

MLA

Folkedahl Bruce C, Schobert Harold H and Schobert Harold H.: . .