Graham Holdings Company (formerly The Washington Post Company) MarketLine Company Profile. MarketLine, a Progressive Digital Media business.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Graham Holdings Company (formerly The Washington Post Company) MarketLine Company Profile. MarketLine, a Progressive Digital Media business.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Graham Holdings Company (formerly The Washington Post Company) MarketLine Company Profile. MarketLine, a Progressive Digital Media business.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.