Printing a publication from InDesign is not as straight forward as other software products.
You can print directly in InDesign, but the quality of the print is not there and can pixelate.
Instead, save the documents a .pdf and then print the file as a .pdf. The quality is there and the images which most likely would have been pixelated in an InDesign print are really sharp and clear.
When editing a file, before printing make sure that you save it as a .pdf, then print the .pdf.