Łukasiewicz A., 1989. Criteria of collecting rare and threatened plants from their natural localities. [W:] The 3rd International Meeting of the European – Mediterranean Division of the International Association of the Botanical Gardens (29 May-June 1989), Budapest-Vácrátót Węgry. materiały konferencyjne – streszczenie referatu.

Łukasiewicz A., 1989. Criteria of collecting rare and threatened plants from their natural localities. [W:] The 3rd International Meeting of the European – Mediterranean Division of the International Association of the Botanical Gardens (29 May-June 1989), Budapest-Vácrátót Węgry. materiały konferencyjne – streszczenie referatu.