APA

<The >Johns Hopkins University, Leon & George O. Z.<O >Atlas MSD. : .

Chicago

<The >Johns Hopkins University, Leon and George O Zeridema.<O >Atlas MSD. : .

Harvard

<The >Johns Hopkins University, Leon and George O. Z.<O >Atlas MSD. : .

MLA

<The >Johns Hopkins University, Leon and George O Zeridema.: . .