  The contributions of the resonances $D_{13}(1520)$, $S_{11}(1535)$,
$S_{11}(1650)$, $D_{15}(1675)$, $F_{15}(1680)$, $D_{13}(1700)$, $P_{11}(1710)$,
$P_{13}(1720)$ to $\gamma p\to \eta p$ are found from the data on cross
sections, beam and target asymmetries using two approaches: fixed-t dispersion
relations and an isobar model. Utilization of the two approaches and comparison
of the results obtained with different parametrizations of the resonance
contributions allowed us to make conclusions about the model-dependence of
these contributions. We conclude that the results for the contributions of the
resonances $D_{13}(1520)$, $S_{11}(1535)$, $F_{15}(1680)$ to corresponding
multipole amplitudes are stable. With this the results for $D_{13}(1520)$ and
$F_{15}(1680)$, combined with their PDG photoexcitation helicity amplitudes,
allowed us to find the branching ratios $Br (D_{13}(1520)\to \eta N)=0.05\pm
0.02%$, $Br (F_{15}(1680)\to \eta N)=0.16\pm0.04%$ which have significantly
better accuracy than the PDG data. The total Breit-Wigner width of the
$S_{11}(1535)$ is model-dependent, we have obtained $\Gamma (S_{11}(1520))=142
MeV$ and $195 MeV$ using dispersion relations and the isobar model,
respectively. The results for the $S_{11}(1650)$, $D_{15}(1675)$,
$P_{11}(1710)$, $P_{13}(1720)$ are model dependent, only the signs and orders
of magnitude of their contributions to multipole amplitudes are determined. The
results for the $D_{13}(1700)$ are strongly model-dependent.
