Cita APA (7a ed.)

ISTA Mielke GmbH. (1998). Oil world annual 1998. ISTA Mielke GmbH.

Cita Chicago Style (17a ed.)

ISTA Mielke GmbH. Oil World Annual 1998. Hamburg: ISTA Mielke GmbH, 1998.

Cita MLA (9a ed.)

ISTA Mielke GmbH. Oil World Annual 1998. ISTA Mielke GmbH, 1998.