Philippine Prestressed Concrete Company, Inc. (1969). Philippine pioneer in prestressed concrete, 1968-1969. s.n.].
Citace podle Chicago (17th ed.)Philippine Prestressed Concrete Company, Inc. Philippine Pioneer in Prestressed Concrete, 1968-1969. [Marikina Heights, Rizal: s.n.], 1969.
Citace podle MLA (9th ed.)Philippine Prestressed Concrete Company, Inc. Philippine Pioneer in Prestressed Concrete, 1968-1969. s.n.], 1969.
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