APA

Halsall (Fred), . (1999). Data Communications Computer Networks And Open Systems. : .

Chicago

Halsall (Fred), . 1999. Data Communications Computer Networks And Open Systems. : .

Harvard

Halsall (Fred), . (1999). Data Communications Computer Networks And Open Systems. : .

MLA

Halsall (Fred), . Data Communications Computer Networks And Open Systems. : . 1999.