Παραπομπή σε μορφή APA (7η εκδ.)

Gregory, W. R., Smythe, C., & Yeats, W. B. (1981). Robert Gregory 1881-1918: A centenary tribute with a foreword by his children. Colin Smythe.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Gregory, William Robert, Colin Smythe, και W. B. Yeats. Robert Gregory 1881-1918: A Centenary Tribute with a Foreword by His Children. Gerrards Cross, Buckinghamshire: Colin Smythe, 1981.

Παραπομπή σε μορφή MLA (8th εκδ.)

Gregory, William Robert, et al. Robert Gregory 1881-1918: A Centenary Tribute with a Foreword by His Children. Colin Smythe, 1981.