Gaya APA
Spriegel, W.R.. (1957).
Elements of supervision (text).
:
.
Gaya Chicago
Spriegel, W.R..
Elements of supervision.
text
:
,
1957.
.
Gaya MLA
Spriegel, W.R..
Elements of supervision.
text
:
,
1957.
.
Gaya Turabian
Spriegel, W.R..
Elements of supervision.
text
:
,
1957.
.