Ross, S., & Biesty, S. (2011). Into the unknown: How great explorers found their way by land, sea, and air (1st U.S. ed.). Candlewick Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ross, Stewart, و Stephen Biesty. Into the Unknown: How Great Explorers Found Their Way by Land, Sea, and Air. 1st U.S. ed. Somerville, Mass.: Candlewick Press, 2011.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ross, Stewart, و Stephen Biesty. Into the Unknown: How Great Explorers Found Their Way by Land, Sea, and Air. 1st U.S. ed. Candlewick Press, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.