Ohlsen, B. (2019). Walking Portland: 33 tours of Stumptown's funky neighborhoods, historic landmarks, parks, farmers markets, and brewpubs (Second Edition.). Wilderness Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ohlsen, Becky. Walking Portland: 33 Tours of Stumptown's Funky Neighborhoods, Historic Landmarks, Parks, Farmers Markets, and Brewpubs. Second Edition. Birmingham, Alabama: Wilderness Press, 2019.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ohlsen, Becky. Walking Portland: 33 Tours of Stumptown's Funky Neighborhoods, Historic Landmarks, Parks, Farmers Markets, and Brewpubs. Second Edition. Wilderness Press, 2019.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.