APA

Roddy (Dennis); Coolen (John), . (1995). Electronic Communications. Ed 4. : .

Chicago

Roddy (Dennis); Coolen (John), . 1995. Electronic Communications. Ed 4. : .

Harvard

Roddy (Dennis); Coolen (John), . (1995). Electronic Communications. Ed 4. : .

MLA

Roddy (Dennis); Coolen (John), . Electronic Communications. Ed 4. : . 1995.