Ryan, C. (2014). Manhattan Prep: Geometry:GMAT Strategy guide 4. MG Prep Inc.
Lua i Stíl Chicago (17ú heag.)Ryan, Chris. Manhattan Prep: Geometry:GMAT Strategy Guide 4. Manhattan: MG Prep Inc, 2014.
Lua MLA (9ú heag.)Ryan, Chris. Manhattan Prep: Geometry:GMAT Strategy Guide 4. MG Prep Inc, 2014.
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