Grace, S. (2015). Heavy Metals Determination in the Rivers in Kuching City and Relationship of the Land-use Changes to the Heavy Metals Present in Water.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Grace, Stephen. Heavy Metals Determination in the Rivers in Kuching City and Relationship of the Land-use Changes to the Heavy Metals Present in Water. 2015.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Grace, Stephen. Heavy Metals Determination in the Rivers in Kuching City and Relationship of the Land-use Changes to the Heavy Metals Present in Water. 2015.
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