Verne, J., & Gray, E. (2008). A journey to the centre of the earth: Activity book. Express Publishing.
Chicago Style (17. basım) AtıfVerne, Jules, ve Elizabeth Gray. A Journey to the Centre of the Earth: Activity Book. Express Publishing, 2008.
MLA (9th ed.) AtıfVerne, Jules, ve Elizabeth Gray. A Journey to the Centre of the Earth: Activity Book. Express Publishing, 2008.
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