Cita APA (7a ed.)

ISTA Mielke GmbH & Mielke, T. (1990). Oil world annual 1990. ISTA Mielke GmbH.

Cita Chicago Style (17a ed.)

ISTA Mielke GmbH y Thomas Mielke. Oil World Annual 1990. Hamburg: ISTA Mielke GmbH, 1990.

Cita MLA (9a ed.)

ISTA Mielke GmbH y Thomas Mielke. Oil World Annual 1990. ISTA Mielke GmbH, 1990.