Παραπομπή APA

Groen, P. (1969). Waters of the sea. Van Nostrand Reinhold Company.

Παραπομπή Chicago Style

Groen, P. Waters of the Sea. London: Van Nostrand Reinhold Company, 1969.

Παραπομπή MLA

Groen, P. Waters of the Sea. Van Nostrand Reinhold Company, 1969.