Chicago: "XXVIII," Sonnets from the Portuguese Original Sources, accessed May 13, 2025, http://www.originalsources.com/Document.aspx?DocID=85JC5YJ465FEREN.
MLA: "XXVIII." Sonnets from the Portuguese, Original Sources. 13 May. 2025. http://www.originalsources.com/Document.aspx?DocID=85JC5YJ465FEREN.
Harvard: 1850, 'XXVIII' in Sonnets from the Portuguese. Original Sources, retrieved 13 May 2025, from http://www.originalsources.com/Document.aspx?DocID=85JC5YJ465FEREN.