Marshall, J. M. 1., Battle, E. K., & Jones, M. A. 1. (1993). For hard things: Unison version (New edition.). Garland, Texas: Choristers Guild.
Citación estilo ChicagoMarshall, Jane Manton 1924-, Edith Kent Battle, y Mary Alice 1898-1980 Jones. For Hard Things: Unison Version. New edition. Garland, Texas: Choristers Guild, 1993.
Cita MLAMarshall, Jane Manton 1924-, Edith Kent Battle, y Mary Alice 1898-1980 Jones. For Hard Things: Unison Version. New edition. Garland, Texas: Choristers Guild, 1993.
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