William C. Pollard Jr. (November 1, 2010). "email to Lonely Planet". Boracay Budget Travel website. p. 2. Archived from the original on June 30, 2012.
"Motorized Tricycles". Boracay Budget Travel Tips. Archived from the original on June 30, 2012. Retrieved April 27, 2013.; William C. Pollard, Jr., email to Lonely Planet, November 1, 2010, p. 2.
Otsuka, Keijiro; Kikuchi, Masao; Hayami, Yujiro (January 1986). "Community and Market in Contract Choice: The Jeepney in the Philippines". Economic Development and Cultural Change. 34 (2): 279–298. doi:10.1086/451528. JSTOR1153851. S2CID155062784.
Otsuka, Keijiro; Kikuchi, Masao; Hayami, Yujiro (January 1986). "Community and Market in Contract Choice: The Jeepney in the Philippines". Economic Development and Cultural Change. 34 (2): 279–298. doi:10.1086/451528. JSTOR1153851. S2CID155062784.
Otsuka, Keijiro; Kikuchi, Masao; Hayami, Yujiro (January 1986). "Community and Market in Contract Choice: The Jeepney in the Philippines". Economic Development and Cultural Change. 34 (2): 279–298. doi:10.1086/451528. JSTOR1153851. S2CID155062784.
"Motorized Tricycles". Boracay Budget Travel Tips. Archived from the original on June 30, 2012. Retrieved April 27, 2013.; William C. Pollard, Jr., email to Lonely Planet, November 1, 2010, p. 2.