Citazione APA

Hela, I., & Laevastu, T. (1961). Fisheries hydrograph. Fishing news.

Stile di citazione Chicago

Hela, Ilmo, e Taivo Laevastu. Fisheries Hydrograph. London: Fishing news, 1961.

Citazione MLA

Hela, Ilmo, e Taivo Laevastu. Fisheries Hydrograph. Fishing news, 1961.