KOSKI, Veikko et al. Technical guidelines for genetic conservation of Norway spruce (Picea abies (L.) Karst.). Rome : International Plant Genetic Resources Institute, 1997. 46 p. Dostupné na internete: <https://www.bioversityinternational.org/fileadmin/_migrated/uploads/tx_news/Technical_guidelines_for_genetic_conservation_of_Norway_spruce__Picea_abies__L.__Karst.__278.pdf> ISBN 92-9043-331-X.