Welsch, Bernard (Jun 2004). "Was Marcus Island Discovered by Bernardo de la Torre in 1543?". The Journal of Pacific History. 39 (1). Taylor & Francis. Ltd.: 114, 120. doi:10.1080/00223340410001684886. S2CID219627973.
Welsch, Bernard (Jun 2004). "Was Marcus Island Discovered by Bernardo de la Torre in 1543?". The Journal of Pacific History. 39 (1). Taylor & Francis. Ltd.: 114, 120. doi:10.1080/00223340410001684886. S2CID219627973.