Engineering Thermodynamics
When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

First law of thermodynamics
Second law of thermodynamics
Kelvin Planck's law
Zeroth law of thermodynamics

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Engineering Thermodynamics
In order that a cycle be reversible, following must be satisfied

When heat is being absorbed, temperature of hot source and working substance should be same
When beat is being rejected, temperature of cold source and working substance should be same
All of these
Free expansion or friction resisted expansion/compression process should not be encountered

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