Sölvell, Ö. (1987). Entry barriers and foreign penetration: Emerging patterns of international competition in two electrical engineering industries. Stockholm School of Economics, Institute of International Business.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sölvell, Örjan. Entry Barriers and Foreign Penetration: Emerging Patterns of International Competition in Two Electrical Engineering Industries. Stockholm: Stockholm School of Economics, Institute of International Business, 1987.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sölvell, Örjan. Entry Barriers and Foreign Penetration: Emerging Patterns of International Competition in Two Electrical Engineering Industries. Stockholm School of Economics, Institute of International Business, 1987.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.