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