Doe (2013), p. 21. Doe, Helen (2013). "Power, Authority and Communications: The Role of the Master and the Managing Owner in Nineteenth-Century British Merchant Shipping". International Journal of Maritime History. 25 (1): 1–22. doi:10.1177/084387141302500106. S2CID167867674.
Doe (2013), p. 10. Doe, Helen (2013). "Power, Authority and Communications: The Role of the Master and the Managing Owner in Nineteenth-Century British Merchant Shipping". International Journal of Maritime History. 25 (1): 1–22. doi:10.1177/084387141302500106. S2CID167867674.
Doe (2013), p. 21. Doe, Helen (2013). "Power, Authority and Communications: The Role of the Master and the Managing Owner in Nineteenth-Century British Merchant Shipping". International Journal of Maritime History. 25 (1): 1–22. doi:10.1177/084387141302500106. S2CID167867674.
Doe (2013), p. 10. Doe, Helen (2013). "Power, Authority and Communications: The Role of the Master and the Managing Owner in Nineteenth-Century British Merchant Shipping". International Journal of Maritime History. 25 (1): 1–22. doi:10.1177/084387141302500106. S2CID167867674.