Herrick, S.; Baker, R. M. L. Jr.; Hilton, C. G. (1958-01-01). "Gravitational and Related Constants for Accurate Space Navigation". In Hecht, F. (ed.). VIIIth International Astronautical Congress Barcelona 1957 / VIII. Internationaler Astronautischer Kongress / VIIIe Congrès International d'Astronautique. Springer Berlin Heidelberg. pp. 197–235. doi:10.1007/978-3-662-39990-3_17. ISBN9783662390207.