Hellgren, O. (1984). Acclimation to quantum flux density, temperature and photoperiod as effects on growth, development, chlorophyll content and leaf characteristics in Pelargonium zonale hybr. Swedish University of Agricultural Sciences.
Čikaški stil citiranja (17. izdanje)Hellgren, Olof. Acclimation to Quantum Flux Density, Temperature and Photoperiod as Effects on Growth, Development, Chlorophyll Content and Leaf Characteristics in Pelargonium Zonale Hybr. Alnarp: Swedish University of Agricultural Sciences, 1984.
MLA način citiranja (8. izdanje)Hellgren, Olof. Acclimation to Quantum Flux Density, Temperature and Photoperiod as Effects on Growth, Development, Chlorophyll Content and Leaf Characteristics in Pelargonium Zonale Hybr. Swedish University of Agricultural Sciences, 1984.