Farida Yusuf. (2001). Comparative studies on the biodiversity of pteridophytes in selected natural and man-made forests in Johor (Malaysia) and Singapore.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Farida Yusuf. Comparative Studies on the Biodiversity of Pteridophytes in Selected Natural and Man-made Forests in Johor (Malaysia) and Singapore. 2001.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Farida Yusuf. Comparative Studies on the Biodiversity of Pteridophytes in Selected Natural and Man-made Forests in Johor (Malaysia) and Singapore. 2001.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.