🚀 go-pugleaf

I want an appendix with bibliography, index, etc. to look like

    +----------------+
    | A Bibliography |
    |  [1] ref. one  |
    |  [2] ref. two  |
    |                |
    | B Index        |
    |  item one, #   |
    |                |
    | C List of ...  |
    |                |
    | etc.           |
    |                |
    +----------------+

But with the following input

	\begin{appendix}
	
	%\chapter{Bibliography}
	\bibliographystyle{alpha}
	
	%\chapter{Index}
	\printindex
	
	\end{appendix}

all I get is

    +----------------+        +----------------+
    | A Bibliography |   or   | Bibliography   |
    | Bibliography   |        |  [1] ref. one  |
    |  [1] ref. one  |        |  [2] ref. two  |
    |  [2] ref. two  |        |                |
    |                |        |                |
    | B Index        |        | Index          |
    | Index          |        |  item one, #   |
    |  item one, #   |        |                |
    |                |        |                |
    | C List of ...  |        | C List of ...  |
    |                |        |                |
    | etc.           |        | etc.           |
    |                |        |                |
    +----------------+        +----------------+
    chapter names twice       chapters not numbered A, B, ...


Who can help?

Horst