APA

[Envo Publishing Co.], . (1976). New horizons in construction materials. Lehigh Valley, PA: [Envo Publishing Co.].

Chicago

[Envo Publishing Co.], . 1976. New horizons in construction materials. Lehigh Valley, PA: [Envo Publishing Co.].

Harvard

[Envo Publishing Co.], . (1976). New horizons in construction materials. Lehigh Valley, PA: [Envo Publishing Co.].

MLA

[Envo Publishing Co.], . New horizons in construction materials. Lehigh Valley, PA: [Envo Publishing Co.]. 1976.