APA

Gopalakrishnan (K R), . (1990). Engineering Drawing Vol.I Ed.3. : .

Chicago

Gopalakrishnan (K R), . 1990. Engineering Drawing Vol.I Ed.3. : .

Harvard

Gopalakrishnan (K R), . (1990). Engineering Drawing Vol.I Ed.3. : .

MLA

Gopalakrishnan (K R), . Engineering Drawing Vol.I Ed.3. : . 1990.