Cita APA (7a ed.)

ISTA Mielke GmbH & Mielke, T. (1997). Oil world annual 1997. ISTA Mielke GmbH.

Cita Chicago Style (17a ed.)

ISTA Mielke GmbH y Thomas Mielke. Oil World Annual 1997. Hamburg: ISTA Mielke GmbH, 1997.

Cita MLA (9a ed.)

ISTA Mielke GmbH y Thomas Mielke. Oil World Annual 1997. ISTA Mielke GmbH, 1997.