Citazione Stile APA (7a Edizione)

Wahl, E., & Hickel, W. (1999). Hydrochemistry and phytoplankton abundance at time series station Helgoland Roads, North Sea, in 1990. PANGAEA.

Citazione stile Chigago Style (17a edizione)

Wahl, E., e Wolfgang Hickel. Hydrochemistry and Phytoplankton Abundance at Time Series Station Helgoland Roads, North Sea, in 1990. PANGAEA, 1999.

Citatione MLA (9a ed.)

Wahl, E., e Wolfgang Hickel. Hydrochemistry and Phytoplankton Abundance at Time Series Station Helgoland Roads, North Sea, in 1990. PANGAEA, 1999.