APA

G.Harvey ;K.Y.Nelson, .Word Perfect Instant Reference For Version 4.2. : .

Chicago

G.Harvey ;K.Y.Nelson, .Word Perfect Instant Reference For Version 4.2. : .

Harvard

G.Harvey ;K.Y.Nelson, .Word Perfect Instant Reference For Version 4.2. : .

MLA

G.Harvey ;K.Y.Nelson, .: . .