Ensch, J., Muller, J., Owen, R. E., & Gonner, N. (1987). Luxembourgers in the new world: A reedition based on the work of Nicholas Gonner "Die Luxemburger in der Neuen Welt", Dubuque, Iowa, 1889 : published with a complete index ... Esch-sur-Alzette, Grand Duchy of Luxembourg: Editions-Reliures Schortgen.

Ensch, Jean., Jean-Claude Muller, Robert E. Owen, and Nicholas Gonner. Luxembourgers in the New World: A Reedition Based On the Work of Nicholas Gonner "Die Luxemburger in Der Neuen Welt", Dubuque, Iowa, 1889 : Published With a Complete Index ... Esch-sur-Alzette, Grand Duchy of Luxembourg: Editions-Reliures Schortgen, 1987.

Ensch, Jean., Jean-Claude Muller, Robert E. Owen, and Nicholas Gonner. Luxembourgers in the New World: A Reedition Based On the Work of Nicholas Gonner "Die Luxemburger in Der Neuen Welt", Dubuque, Iowa, 1889 : Published With a Complete Index ... Esch-sur-Alzette, Grand Duchy of Luxembourg: Editions-Reliures Schortgen, 1987.