Gaya APA

Janssens, J. ([s.a.]). Practical petroleum tables for ship's use : rapid conversion of cubic feet to long and metric tons . [s.l.]: [s.n.].

Gaya MLA

Janssens, J.A.. "Practical petroleum tables for ship's use : rapid conversion of cubic feet to long and metric tons". [s.l.]: [s.n.], [s.a.]. Text.