Olofsson, E. (1988). Epizootiology of the nuclear polyhedrosis virus of the European pine sawfly, Neodiprion sertifer (Fourcroy) (Hymenoptera, Diprionidae). Swedish University of Agricultural Sciences, Dept. of Plant and Forest Protection, Division of Forest Entomology.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Olofsson, Einar. Epizootiology of the Nuclear Polyhedrosis Virus of the European Pine Sawfly, Neodiprion Sertifer (Fourcroy) (Hymenoptera, Diprionidae). Uppsala, Sweden: Swedish University of Agricultural Sciences, Dept. of Plant and Forest Protection, Division of Forest Entomology, 1988.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Olofsson, Einar. Epizootiology of the Nuclear Polyhedrosis Virus of the European Pine Sawfly, Neodiprion Sertifer (Fourcroy) (Hymenoptera, Diprionidae). Swedish University of Agricultural Sciences, Dept. of Plant and Forest Protection, Division of Forest Entomology, 1988.