(EN) Tom Lansford (a cura di), Political Handbook of the World 2014, Washington, CQ Press, 2014, pp. 811-812, ISBN 978-148-333-3-274.
«In 2009 the TSP, New Center, and the Social Democratic Party (Sociāldemokrātiskā partija—SDP) regrouped as the Social Democratic Party “Harmony” [...]»