Geodesic
On Conjugacy $p$-Separability of Free Products of Two Groups with Amalgamation
Matematičeskie zametki, Tome 76 (2004) no. 4, pp. 502-509

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It is proved that a free product of two finite $p$-groups with amalgamated central subgroups is a conjugacy $p$-separable group. With the help of this result, it is proved that a free product with amalgamated subgroups of two finitely generated Abelian groups is a residually finite $p$-group if and only if it is conjugacy $p$-separable. 
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     author = {E. A. Ivanova},
     title = {On {Conjugacy} $p${-Separability} of {Free} {Products} of {Two} {Groups} with {Amalgamation}},
     journal = {Matemati\v{c}eskie zametki},
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E. A. Ivanova. On Conjugacy $p$-Separability of Free Products of Two Groups with Amalgamation. Matematičeskie zametki, Tome 76 (2004) no. 4, pp. 502-509. http://geodesic.mathdoc.fr/item/MZM_2004_76_4_a2/