APA
Porter T. &. G. B., . (1980). Manual of graphic techniques 1. Astragal Books, London: .
Chicago
Porter Tom & Greenstreet Bob, . 1980. Manual of graphic techniques 1. Astragal Books, London: .
Harvard
Porter T. &. G. B., . (1980). Manual of graphic techniques 1. Astragal Books, London: .
MLA
Porter Tom & Greenstreet Bob, . Manual of graphic techniques 1. Astragal Books, London: . 1980.