Abbildungsreferenz am Ende der ersten Satzes oder am Ende des gesamten Absatzes?
wenn ich z.b. ein Diagramm beschreibe im Text, schreibe ich dann (vgl. Abb. xy) nach der ersten Aussage oder erst am ende des absatzes nachdem ich alles beschrieben habe?
The placement of the reference depends, in my knowledge, on the citation style and clarity of the text. As a rule:
If you write an image in the text and extend your description over several sentences, it is probably best to place the reference directly after the first mention of the image, that is, at the end of the first sentence in which you point to the image (e.g., “…as shown in Fig. xy”). This makes it clear to the reader at the beginning of your description what you refer to. It would be, I think, but also possible to incorporate the reference at the end of the paragraph.