Cita APA

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

Citación estilo Chicago

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

Cita MLA

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