Cita APA (7a ed.)

Mielke, T. (1999). Oil world annual 1999. ISTA Mielke GmbH.

Cita Chicago Style (17a ed.)

Mielke, Thomas. Oil World Annual 1999. Hamburg: ISTA Mielke GmbH, 1999.

Cita MLA (9a ed.)

Mielke, Thomas. Oil World Annual 1999. ISTA Mielke GmbH, 1999.